diff --git a/code/__DEFINES/DNA.dm b/code/__DEFINES/DNA.dm
index 61aac5076ff..0d5bd609202 100644
--- a/code/__DEFINES/DNA.dm
+++ b/code/__DEFINES/DNA.dm
@@ -119,6 +119,10 @@
 #define NOSTOMACH		28
 #define NO_DNA_COPY     29
 #define DRINKSBLOOD		30
+#define SPECIES_ORGANIC 31
+#define SPECIES_INORGANIC 32
+#define SPECIES_UNDEAD  33
+#define SPECIES_ROBOTIC 34
 
 #define ORGAN_SLOT_BRAIN "brain"
 #define ORGAN_SLOT_APPENDIX "appendix"
diff --git a/code/datums/diseases/_MobProcs.dm b/code/datums/diseases/_MobProcs.dm
index f13239a113b..7c08a3908f6 100644
--- a/code/datums/diseases/_MobProcs.dm
+++ b/code/datums/diseases/_MobProcs.dm
@@ -143,14 +143,25 @@
 //Proc to use when you 100% want to infect someone, as long as they aren't immune
 /mob/proc/ForceContractDisease(datum/disease/D)
 	if(!CanContractDisease(D))
-		return 0
+		return FALSE
 	AddDisease(D)
 
 
 /mob/living/carbon/human/CanContractDisease(datum/disease/D)
-	if(dna && (VIRUSIMMUNE in dna.species.species_traits) && !D.bypasses_immunity)
-		return 0
+
+	if(dna)
+		if((VIRUSIMMUNE in dna.species.species_traits) && !D.bypasses_immunity)
+			return FALSE
+
+		var/can_infect = FALSE
+		for(var/host_type in D.infectable_hosts)
+			if(host_type in dna.species.species_traits)
+				can_infect = TRUE
+				break
+		if(!can_infect)
+			return FALSE
+
 	for(var/thing in D.required_organs)
 		if(!((locate(thing) in bodyparts) || (locate(thing) in internal_organs)))
-			return 0
+			return FALSE
 	return ..()
\ No newline at end of file
diff --git a/code/datums/diseases/_disease.dm b/code/datums/diseases/_disease.dm
index 69da2ab96dd..547b1d5db93 100644
--- a/code/datums/diseases/_disease.dm
+++ b/code/datums/diseases/_disease.dm
@@ -30,6 +30,8 @@
 	var/list/required_organs = list()
 	var/needs_all_cures = TRUE
 	var/list/strain_data = list() //dna_spread special bullshit
+	var/list/infectable_hosts = list(SPECIES_ORGANIC) //if the disease can spread on organics, synthetics, or undead
+	var/process_dead = FALSE //if this ticks while the host is dead
 
 /datum/disease/Destroy()
 	affected_mob = null
diff --git a/code/datums/diseases/advance/symptoms/species.dm b/code/datums/diseases/advance/symptoms/species.dm
new file mode 100644
index 00000000000..837252c1e60
--- /dev/null
+++ b/code/datums/diseases/advance/symptoms/species.dm
@@ -0,0 +1,30 @@
+/datum/symptom/undead_adaptation
+	name = "Necrotic Metabolism"
+	desc = "The virus is able to thrive and act even within dead hosts."
+	stealth = 2
+	resistance = -2
+	stage_speed = 1
+	transmittable = 0
+	level = 5
+	severity = 0
+
+/datum/symptom/undead_adaptation/Start(datum/disease/advance/A)
+	if(!..())
+		return
+	A.process_dead = TRUE
+	A.infectable_hosts |= SPECIES_UNDEAD
+
+/datum/symptom/inorganic_adaptation
+	name = "Inorganic Biology"
+	desc = "The virus can survive and replicate even in an inorganic environment, increasing its resistance and infection rate."
+	stealth = -1
+	resistance = 4
+	stage_speed = -2
+	transmittable = 3
+	level = 5
+	severity = 0
+
+/datum/symptom/inorganic_adaptation/Start(datum/disease/advance/A)
+	if(!..())
+		return
+	A.infectable_hosts |= SPECIES_INORGANIC
\ No newline at end of file
diff --git a/code/datums/diseases/beesease.dm b/code/datums/diseases/beesease.dm
index e380cecf39a..dc848ab622a 100644
--- a/code/datums/diseases/beesease.dm
+++ b/code/datums/diseases/beesease.dm
@@ -10,6 +10,7 @@
 	viable_mobtypes = list(/mob/living/carbon/human, /mob/living/carbon/monkey)
 	desc = "If left untreated subject will regurgitate bees."
 	severity = VIRUS_SEVERITY_MEDIUM
+	infectable_hosts = list(SPECIES_ORGANIC, SPECIES_UNDEAD) //bees nesting in corpses
 
 /datum/disease/beesease/stage_act()
 	..()
diff --git a/code/datums/diseases/magnitis.dm b/code/datums/diseases/magnitis.dm
index cc8204a717a..91ce1ca71ed 100644
--- a/code/datums/diseases/magnitis.dm
+++ b/code/datums/diseases/magnitis.dm
@@ -10,6 +10,8 @@
 	permeability_mod = 0.75
 	desc = "This disease disrupts the magnetic field of your body, making it act as if a powerful magnet. Injections of iron help stabilize the field."
 	severity = VIRUS_SEVERITY_MEDIUM
+	infectable_hosts = list(SPECIES_ORGANIC, SPECIES_ROBOTIC)
+	process_dead = TRUE
 
 /datum/disease/magnitis/stage_act()
 	..()
diff --git a/code/datums/diseases/parrotpossession.dm b/code/datums/diseases/parrotpossession.dm
index 42d5daa797a..284c3bd7f28 100644
--- a/code/datums/diseases/parrotpossession.dm
+++ b/code/datums/diseases/parrotpossession.dm
@@ -11,6 +11,8 @@
 	viable_mobtypes = list(/mob/living/carbon/human)
 	desc = "Subject is possesed by the vengeful spirit of a parrot. Call the priest."
 	severity = VIRUS_SEVERITY_MEDIUM
+	infectable_hosts = list(SPECIES_ORGANIC, SPECIES_UNDEAD, SPECIES_INORGANIC, SPECIES_ROBOTIC)
+	bypasses_immunity = TRUE //2spook
 	var/mob/living/simple_animal/parrot/Poly/ghost/parrot
 
 /datum/disease/parrot_possession/stage_act()
diff --git a/code/datums/diseases/rhumba_beat.dm b/code/datums/diseases/rhumba_beat.dm
index 855f1f44f01..8217364fb56 100644
--- a/code/datums/diseases/rhumba_beat.dm
+++ b/code/datums/diseases/rhumba_beat.dm
@@ -9,6 +9,7 @@
 	viable_mobtypes = list(/mob/living/carbon/human)
 	permeability_mod = 1
 	severity = VIRUS_SEVERITY_BIOHAZARD
+	process_dead = TRUE
 
 /datum/disease/rhumba_beat/stage_act()
 	..()
diff --git a/code/datums/diseases/transformation.dm b/code/datums/diseases/transformation.dm
index 0ff47f854da..60622f61cba 100644
--- a/code/datums/diseases/transformation.dm
+++ b/code/datums/diseases/transformation.dm
@@ -127,7 +127,7 @@
 	stage4	= list("<span class='danger'>Your skin feels very loose.</span>", "<span class='danger'>You can feel... something...inside you.</span>")
 	stage5	= list("<span class='danger'>Your skin feels as if it's about to burst off!</span>")
 	new_form = /mob/living/silicon/robot
-
+	infectable_hosts = list(SPECIES_ORGANIC, SPECIES_UNDEAD, SPECIES_ROBOTIC)
 
 /datum/disease/transformation/robot/stage_act()
 	..()
@@ -240,3 +240,4 @@
 	stage4	= list("<span class='danger'>You're ravenous.</span>")
 	stage5	= list("<span class='danger'>You have become a morph.</span>")
 	new_form = /mob/living/simple_animal/hostile/morph
+	infectable_hosts = list(SPECIES_ORGANIC, SPECIES_INORGANIC, SPECIES_UNDEAD) //magic!
diff --git a/code/modules/mob/living/carbon/human/species_types/abductors.dm b/code/modules/mob/living/carbon/human/species_types/abductors.dm
index 160b0b73a1e..cf03d12130b 100644
--- a/code/modules/mob/living/carbon/human/species_types/abductors.dm
+++ b/code/modules/mob/living/carbon/human/species_types/abductors.dm
@@ -3,7 +3,7 @@
 	id = "abductor"
 	say_mod = "gibbers"
 	sexes = FALSE
-	species_traits = list(NOBLOOD,NOBREATH,VIRUSIMMUNE,NOGUNS,NOHUNGER)
+	species_traits = list(SPECIES_ORGANIC,NOBLOOD,NOBREATH,VIRUSIMMUNE,NOGUNS,NOHUNGER)
 	mutanttongue = /obj/item/organ/tongue/abductor
 	var/scientist = FALSE // vars to not pollute spieces list with castes
 
diff --git a/code/modules/mob/living/carbon/human/species_types/android.dm b/code/modules/mob/living/carbon/human/species_types/android.dm
index 44f1e5c456a..4badfa84053 100644
--- a/code/modules/mob/living/carbon/human/species_types/android.dm
+++ b/code/modules/mob/living/carbon/human/species_types/android.dm
@@ -2,7 +2,7 @@
 	name = "Android"
 	id = "android"
 	say_mod = "states"
-	species_traits = list(NOBREATH,RESISTHOT,RESISTCOLD,RESISTPRESSURE,NOFIRE,NOBLOOD,VIRUSIMMUNE,PIERCEIMMUNE,NOHUNGER,EASYLIMBATTACHMENT)
+	species_traits = list(SPECIES_ROBOTIC,NOBREATH,RESISTHOT,RESISTCOLD,RESISTPRESSURE,NOFIRE,NOBLOOD,PIERCEIMMUNE,NOHUNGER,EASYLIMBATTACHMENT)
 	meat = null
 	damage_overlay_type = "synth"
 	mutanttongue = /obj/item/organ/tongue/robot
diff --git a/code/modules/mob/living/carbon/human/species_types/angel.dm b/code/modules/mob/living/carbon/human/species_types/angel.dm
index ecc2ff6c68c..fed10446f1c 100644
--- a/code/modules/mob/living/carbon/human/species_types/angel.dm
+++ b/code/modules/mob/living/carbon/human/species_types/angel.dm
@@ -2,7 +2,7 @@
 	name = "Angel"
 	id = "angel"
 	default_color = "FFFFFF"
-	species_traits = list(EYECOLOR,HAIR,FACEHAIR,LIPS)
+	species_traits = list(SPECIES_ORGANIC,EYECOLOR,HAIR,FACEHAIR,LIPS)
 	mutant_bodyparts = list("tail_human", "ears", "wings")
 	default_features = list("mcolor" = "FFF", "tail_human" = "None", "ears" = "None", "wings" = "Angel")
 	use_skintones = 1
diff --git a/code/modules/mob/living/carbon/human/species_types/corporate.dm b/code/modules/mob/living/carbon/human/species_types/corporate.dm
index e44379e51e4..0040773ad37 100644
--- a/code/modules/mob/living/carbon/human/species_types/corporate.dm
+++ b/code/modules/mob/living/carbon/human/species_types/corporate.dm
@@ -15,5 +15,5 @@
 	attack_sound = 'sound/weapons/resonator_blast.ogg'
 	blacklisted = 1
 	use_skintones = 0
-	species_traits = list(RADIMMUNE,VIRUSIMMUNE,NOBLOOD,PIERCEIMMUNE,EYECOLOR,NODISMEMBER,NOHUNGER)
+	species_traits = list(SPECIES_ORGANIC,RADIMMUNE,VIRUSIMMUNE,NOBLOOD,PIERCEIMMUNE,EYECOLOR,NODISMEMBER,NOHUNGER)
 	sexes = 0
\ No newline at end of file
diff --git a/code/modules/mob/living/carbon/human/species_types/dullahan.dm b/code/modules/mob/living/carbon/human/species_types/dullahan.dm
index 5effff5bd3c..78cf1a3b7a3 100644
--- a/code/modules/mob/living/carbon/human/species_types/dullahan.dm
+++ b/code/modules/mob/living/carbon/human/species_types/dullahan.dm
@@ -2,7 +2,7 @@
 	name = "dullahan"
 	id = "dullahan"
 	default_color = "FFFFFF"
-	species_traits = list(EYECOLOR,HAIR,FACEHAIR,LIPS,NOBREATH,NOHUNGER)
+	species_traits = list(SPECIES_ORGANIC,EYECOLOR,HAIR,FACEHAIR,LIPS,NOBREATH,NOHUNGER)
 	mutant_bodyparts = list("tail_human", "ears", "wings")
 	default_features = list("mcolor" = "FFF", "tail_human" = "None", "ears" = "None", "wings" = "None")
 	use_skintones = TRUE
diff --git a/code/modules/mob/living/carbon/human/species_types/flypeople.dm b/code/modules/mob/living/carbon/human/species_types/flypeople.dm
index 60cf66b2b8a..ba6cce76d4c 100644
--- a/code/modules/mob/living/carbon/human/species_types/flypeople.dm
+++ b/code/modules/mob/living/carbon/human/species_types/flypeople.dm
@@ -2,6 +2,7 @@
 	name = "Flyperson"
 	id = "fly"
 	say_mod = "buzzes"
+	species_traits = list(SPECIES_ORGANIC)
 	mutanttongue = /obj/item/organ/tongue/fly
 	mutantliver = /obj/item/organ/liver/fly
 	mutantstomach = /obj/item/organ/stomach/fly
diff --git a/code/modules/mob/living/carbon/human/species_types/golems.dm b/code/modules/mob/living/carbon/human/species_types/golems.dm
index a1e13210762..697d971eae6 100644
--- a/code/modules/mob/living/carbon/human/species_types/golems.dm
+++ b/code/modules/mob/living/carbon/human/species_types/golems.dm
@@ -2,7 +2,7 @@
 	// Animated beings of stone. They have increased defenses, and do not need to breathe. They're also slow as fuuuck.
 	name = "Golem"
 	id = "iron golem"
-	species_traits = list(NOBREATH,RESISTHOT,RESISTCOLD,RESISTPRESSURE,NOFIRE,NOGUNS,NOBLOOD,RADIMMUNE,VIRUSIMMUNE,PIERCEIMMUNE,NODISMEMBER,MUTCOLORS,NO_UNDERWEAR)
+	species_traits = list(SPECIES_INORGANIC,NOBREATH,RESISTHOT,RESISTCOLD,RESISTPRESSURE,NOFIRE,NOGUNS,NOBLOOD,RADIMMUNE,PIERCEIMMUNE,NODISMEMBER,MUTCOLORS,NO_UNDERWEAR)
 	mutant_organs = list(/obj/item/organ/adamantine_resonator)
 	speedmod = 2
 	armor = 55
@@ -76,7 +76,7 @@
 	fixed_mut_color = "a3d"
 	meat = /obj/item/ore/plasma
 	//Can burn and takes damage from heat
-	species_traits = list(NOBREATH,RESISTCOLD,RESISTPRESSURE,NOGUNS,NOBLOOD,RADIMMUNE,VIRUSIMMUNE,PIERCEIMMUNE,NODISMEMBER,MUTCOLORS,NO_UNDERWEAR)
+	species_traits = list(SPECIES_INORGANIC,NOBREATH,RESISTCOLD,RESISTPRESSURE,NOGUNS,NOBLOOD,RADIMMUNE,PIERCEIMMUNE,NODISMEMBER,MUTCOLORS,NO_UNDERWEAR)
 	info_text = "As a <span class='danger'>Plasma Golem</span>, you burn easily. Be careful, if you get hot enough while burning, you'll blow up!"
 	heatmod = 0 //fine until they blow up
 	prefix = "Plasma"
@@ -242,7 +242,7 @@
 	fixed_mut_color = "49311c"
 	meat = /obj/item/stack/sheet/mineral/wood
 	//Can burn and take damage from heat
-	species_traits = list(NOBREATH,RESISTCOLD,RESISTPRESSURE,NOGUNS,NOBLOOD,RADIMMUNE,VIRUSIMMUNE,PIERCEIMMUNE,NODISMEMBER,MUTCOLORS,NO_UNDERWEAR)
+	species_traits = list(SPECIES_ORGANIC,NOBREATH,RESISTCOLD,RESISTPRESSURE,NOGUNS,NOBLOOD,RADIMMUNE,PIERCEIMMUNE,NODISMEMBER,MUTCOLORS,NO_UNDERWEAR)
 	armor = 30
 	burnmod = 1.25
 	heatmod = 1.5
@@ -549,7 +549,7 @@
 	limbs_id = "cultgolem"
 	sexes = FALSE
 	info_text = "As a <span class='danger'>Runic Golem</span>, you possess eldritch powers granted by the Elder God Nar'Sie."
-	species_traits = list(NOBREATH,RESISTHOT,RESISTCOLD,RESISTPRESSURE,NOFIRE,NOGUNS,NOBLOOD,RADIMMUNE,VIRUSIMMUNE,PIERCEIMMUNE,NODISMEMBER,NO_UNDERWEAR) //no mutcolors
+	species_traits = list(SPECIES_INORGANIC,NOBREATH,RESISTHOT,RESISTCOLD,RESISTPRESSURE,NOFIRE,NOGUNS,NOBLOOD,RADIMMUNE,PIERCEIMMUNE,NODISMEMBER,NO_UNDERWEAR) //no mutcolors
 	prefix = "Runic"
 
 	var/obj/effect/proc_holder/spell/targeted/ethereal_jaunt/shift/golem/phase_shift
@@ -603,7 +603,7 @@
 	limbs_id = "clockgolem"
 	info_text = "<span class='bold alloy'>As a </span><span class='bold brass'>clockwork golem</span><span class='bold alloy'>, you are faster than \
 	other types of golem (being a machine), and are immune to electric shocks.</span>"
-	species_traits = list(NO_UNDERWEAR, NOTRANSSTING, NOBREATH, NOZOMBIE, VIRUSIMMUNE, RADIMMUNE, NOBLOOD, RESISTCOLD, RESISTPRESSURE, PIERCEIMMUNE)
+	species_traits = list(SPECIES_INORGANIC,NO_UNDERWEAR, NOTRANSSTING, NOBREATH, NOZOMBIE, RADIMMUNE, NOBLOOD, RESISTCOLD, RESISTPRESSURE, PIERCEIMMUNE)
 	armor = 20 //Reinforced, but much less so to allow for fast movement
 	attack_verb = "smash"
 	attack_sound = 'sound/magic/clockwork/anima_fragment_attack.ogg'
@@ -655,7 +655,7 @@
 	limbs_id = "clothgolem"
 	sexes = FALSE
 	info_text = "As a <span class='danger'>Cloth Golem</span>, you are able to reform yourself after death, provided your remains aren't burned or destroyed. You are, of course, very flammable."
-	species_traits = list(NOBREATH,RESISTCOLD,RESISTPRESSURE,NOGUNS,NOBLOOD,RADIMMUNE,VIRUSIMMUNE,PIERCEIMMUNE,NODISMEMBER,NO_UNDERWEAR) //no mutcolors, and can burn
+	species_traits = list(SPECIES_UNDEAD,NOBREATH,RESISTCOLD,RESISTPRESSURE,NOGUNS,NOBLOOD,RADIMMUNE,PIERCEIMMUNE,NODISMEMBER,NO_UNDERWEAR) //no mutcolors, and can burn
 	armor = 15 //feels no pain, but not too resistant
 	burnmod = 2 // don't get burned
 	speedmod = 1 // not as heavy as stone
diff --git a/code/modules/mob/living/carbon/human/species_types/humans.dm b/code/modules/mob/living/carbon/human/species_types/humans.dm
index 43be1c05a8f..e9f7f2d60b0 100644
--- a/code/modules/mob/living/carbon/human/species_types/humans.dm
+++ b/code/modules/mob/living/carbon/human/species_types/humans.dm
@@ -2,7 +2,7 @@
 	name = "Human"
 	id = "human"
 	default_color = "FFFFFF"
-	species_traits = list(EYECOLOR,HAIR,FACEHAIR,LIPS)
+	species_traits = list(SPECIES_ORGANIC,EYECOLOR,HAIR,FACEHAIR,LIPS)
 	mutant_bodyparts = list("tail_human", "ears", "wings")
 	default_features = list("mcolor" = "FFF", "tail_human" = "None", "ears" = "None", "wings" = "None")
 	use_skintones = 1
diff --git a/code/modules/mob/living/carbon/human/species_types/jellypeople.dm b/code/modules/mob/living/carbon/human/species_types/jellypeople.dm
index 3cacf1b309e..7fc05c44d3b 100644
--- a/code/modules/mob/living/carbon/human/species_types/jellypeople.dm
+++ b/code/modules/mob/living/carbon/human/species_types/jellypeople.dm
@@ -4,7 +4,7 @@
 	id = "jelly"
 	default_color = "00FF90"
 	say_mod = "chirps"
-	species_traits = list(MUTCOLORS,EYECOLOR,NOBLOOD,VIRUSIMMUNE,TOXINLOVER)
+	species_traits = list(SPECIES_ORGANIC,MUTCOLORS,EYECOLOR,NOBLOOD,VIRUSIMMUNE,TOXINLOVER)
 	meat = /obj/item/reagent_containers/food/snacks/meat/slab/human/mutant/slime
 	exotic_blood = "slimejelly"
 	damage_overlay_type = ""
@@ -101,7 +101,7 @@
 	name = "Slimeperson"
 	id = "slime"
 	default_color = "00FFFF"
-	species_traits = list(MUTCOLORS,EYECOLOR,HAIR,FACEHAIR,NOBLOOD,VIRUSIMMUNE, TOXINLOVER)
+	species_traits = list(SPECIES_ORGANIC,MUTCOLORS,EYECOLOR,HAIR,FACEHAIR,NOBLOOD,VIRUSIMMUNE, TOXINLOVER)
 	say_mod = "says"
 	hair_color = "mutcolor"
 	hair_alpha = 150
diff --git a/code/modules/mob/living/carbon/human/species_types/lizardpeople.dm b/code/modules/mob/living/carbon/human/species_types/lizardpeople.dm
index 5d388c2c3cd..dae9746732e 100644
--- a/code/modules/mob/living/carbon/human/species_types/lizardpeople.dm
+++ b/code/modules/mob/living/carbon/human/species_types/lizardpeople.dm
@@ -4,7 +4,7 @@
 	id = "lizard"
 	say_mod = "hisses"
 	default_color = "00FF00"
-	species_traits = list(MUTCOLORS,EYECOLOR,LIPS)
+	species_traits = list(SPECIES_ORGANIC,MUTCOLORS,EYECOLOR,LIPS)
 	mutant_bodyparts = list("tail_lizard", "snout", "spines", "horns", "frills", "body_markings", "legs")
 	mutanttongue = /obj/item/organ/tongue/lizard
 	mutanttail = /obj/item/organ/tail/lizard
diff --git a/code/modules/mob/living/carbon/human/species_types/plasmamen.dm b/code/modules/mob/living/carbon/human/species_types/plasmamen.dm
index 27dc18ecd57..a5c6720db52 100644
--- a/code/modules/mob/living/carbon/human/species_types/plasmamen.dm
+++ b/code/modules/mob/living/carbon/human/species_types/plasmamen.dm
@@ -4,7 +4,7 @@
 	say_mod = "rattles"
 	sexes = 0
 	meat = /obj/item/stack/sheet/mineral/plasma
-	species_traits = list(NOBLOOD,RESISTCOLD,RADIMMUNE,NOTRANSSTING,VIRUSIMMUNE,NOHUNGER)
+	species_traits = list(SPECIES_INORGANIC,NOBLOOD,RESISTCOLD,RADIMMUNE,NOTRANSSTING,NOHUNGER)
 	mutantlungs = /obj/item/organ/lungs/plasmaman
 	mutanttongue = /obj/item/organ/tongue/bone/plasmaman
 	mutantliver = /obj/item/organ/liver/plasmaman
diff --git a/code/modules/mob/living/carbon/human/species_types/podpeople.dm b/code/modules/mob/living/carbon/human/species_types/podpeople.dm
index 09b76575060..ba7c9340e54 100644
--- a/code/modules/mob/living/carbon/human/species_types/podpeople.dm
+++ b/code/modules/mob/living/carbon/human/species_types/podpeople.dm
@@ -3,7 +3,7 @@
 	name = "Podperson"
 	id = "pod"
 	default_color = "59CE00"
-	species_traits = list(MUTCOLORS,EYECOLOR)
+	species_traits = list(SPECIES_ORGANIC,MUTCOLORS,EYECOLOR)
 	attack_verb = "slash"
 	attack_sound = 'sound/weapons/slice.ogg'
 	miss_sound = 'sound/weapons/slashmiss.ogg'
diff --git a/code/modules/mob/living/carbon/human/species_types/shadowpeople.dm b/code/modules/mob/living/carbon/human/species_types/shadowpeople.dm
index afd2ec4e447..17f5bafc420 100644
--- a/code/modules/mob/living/carbon/human/species_types/shadowpeople.dm
+++ b/code/modules/mob/living/carbon/human/species_types/shadowpeople.dm
@@ -9,7 +9,7 @@
 	blacklisted = 1
 	ignored_by = list(/mob/living/simple_animal/hostile/faithless)
 	meat = /obj/item/reagent_containers/food/snacks/meat/slab/human/mutant/shadow
-	species_traits = list(NOBREATH,NOBLOOD,RADIMMUNE,VIRUSIMMUNE)
+	species_traits = list(SPECIES_ORGANIC,NOBREATH,NOBLOOD,RADIMMUNE,VIRUSIMMUNE)
 
 	dangerous_existence = 1
 	mutanteyes = /obj/item/organ/eyes/night_vision
diff --git a/code/modules/mob/living/carbon/human/species_types/skeletons.dm b/code/modules/mob/living/carbon/human/species_types/skeletons.dm
index 80ac9ced0b1..d47f3d71d59 100644
--- a/code/modules/mob/living/carbon/human/species_types/skeletons.dm
+++ b/code/modules/mob/living/carbon/human/species_types/skeletons.dm
@@ -6,7 +6,7 @@
 	blacklisted = 1
 	sexes = 0
 	meat = /obj/item/reagent_containers/food/snacks/meat/slab/human/mutant/skeleton
-	species_traits = list(NOBREATH,RESISTHOT,RESISTCOLD,RESISTPRESSURE,NOBLOOD,RADIMMUNE,VIRUSIMMUNE,PIERCEIMMUNE,NOHUNGER,EASYDISMEMBER,EASYLIMBATTACHMENT)
+	species_traits = list(SPECIES_UNDEAD,NOBREATH,RESISTHOT,RESISTCOLD,RESISTPRESSURE,NOBLOOD,RADIMMUNE,PIERCEIMMUNE,NOHUNGER,EASYDISMEMBER,EASYLIMBATTACHMENT)
 	mutanttongue = /obj/item/organ/tongue/bone
 	damage_overlay_type = ""//let's not show bloody wounds or burns over bones.
 	disliked_food = NONE
diff --git a/code/modules/mob/living/carbon/human/species_types/synths.dm b/code/modules/mob/living/carbon/human/species_types/synths.dm
index 8b21c2a237e..856a472a738 100644
--- a/code/modules/mob/living/carbon/human/species_types/synths.dm
+++ b/code/modules/mob/living/carbon/human/species_types/synths.dm
@@ -3,13 +3,13 @@
 	id = "synth"
 	say_mod = "beep boops" //inherited from a user's real species
 	sexes = 0
-	species_traits = list(NOTRANSSTING,NOBREATH,VIRUSIMMUNE,NODISMEMBER,NOHUNGER) //all of these + whatever we inherit from the real species
+	species_traits = list(SPECIES_ROBOTIC,NOTRANSSTING,NOBREATH,VIRUSIMMUNE,NODISMEMBER,NOHUNGER) //all of these + whatever we inherit from the real species
 	dangerous_existence = 1
 	blacklisted = 1
 	meat = null
 	damage_overlay_type = "synth"
 	limbs_id = "synth"
-	var/list/initial_species_traits = list(NOTRANSSTING,NOBREATH,VIRUSIMMUNE,NODISMEMBER,NOHUNGER,NO_DNA_COPY) //for getting these values back for assume_disguise()
+	var/list/initial_species_traits = list(SPECIES_ROBOTIC,NOTRANSSTING,NOBREATH,VIRUSIMMUNE,NODISMEMBER,NOHUNGER,NO_DNA_COPY) //for getting these values back for assume_disguise()
 	var/disguise_fail_health = 75 //When their health gets to this level their synthflesh partially falls off
 	var/datum/species/fake_species = null //a species to do most of our work for us, unless we're damaged
 
@@ -41,7 +41,8 @@
 		say_mod = S.say_mod
 		sexes = S.sexes
 		species_traits = initial_species_traits.Copy()
-		species_traits.Add(S.species_traits)
+		species_traits |= S.species_traits
+		species_traits -= list(SPECIES_ORGANIC, SPECIES_INORGANIC, SPECIES_UNDEAD)
 		attack_verb = S.attack_verb
 		attack_sound = S.attack_sound
 		miss_sound = S.miss_sound
diff --git a/code/modules/mob/living/carbon/human/species_types/vampire.dm b/code/modules/mob/living/carbon/human/species_types/vampire.dm
index 0d309876c74..6d1384f12f8 100644
--- a/code/modules/mob/living/carbon/human/species_types/vampire.dm
+++ b/code/modules/mob/living/carbon/human/species_types/vampire.dm
@@ -2,7 +2,7 @@
 	name = "vampire"
 	id = "vampire"
 	default_color = "FFFFFF"
-	species_traits = list(EYECOLOR,HAIR,FACEHAIR,LIPS,NOHUNGER,NOBREATH,DRINKSBLOOD)
+	species_traits = list(SPECIES_UNDEAD,EYECOLOR,HAIR,FACEHAIR,LIPS,NOHUNGER,NOBREATH,DRINKSBLOOD)
 	mutant_bodyparts = list("tail_human", "ears", "wings")
 	default_features = list("mcolor" = "FFF", "tail_human" = "None", "ears" = "None", "wings" = "None")
 	exotic_bloodtype = "U"
diff --git a/code/modules/mob/living/carbon/human/species_types/zombies.dm b/code/modules/mob/living/carbon/human/species_types/zombies.dm
index d6dc833e639..4768d959dc0 100644
--- a/code/modules/mob/living/carbon/human/species_types/zombies.dm
+++ b/code/modules/mob/living/carbon/human/species_types/zombies.dm
@@ -8,7 +8,7 @@
 	sexes = 0
 	blacklisted = 1
 	meat = /obj/item/reagent_containers/food/snacks/meat/slab/human/mutant/zombie
-	species_traits = list(NOBREATH,RESISTCOLD,RESISTPRESSURE,NOBLOOD,RADIMMUNE,NOZOMBIE,EASYDISMEMBER,EASYLIMBATTACHMENT,NOTRANSSTING)
+	species_traits = list(SPECIES_UNDEAD,NOBREATH,RESISTCOLD,RESISTPRESSURE,NOBLOOD,RADIMMUNE,NOZOMBIE,EASYDISMEMBER,EASYLIMBATTACHMENT,NOTRANSSTING)
 	mutanttongue = /obj/item/organ/tongue/zombie
 	var/static/list/spooks = list('sound/hallucinations/growl1.ogg','sound/hallucinations/growl2.ogg','sound/hallucinations/growl3.ogg','sound/hallucinations/veryfar_noise.ogg','sound/hallucinations/wail.ogg')
 	disliked_food = NONE
@@ -73,6 +73,7 @@
 	id = "goofzombies"
 	limbs_id = "zombie" //They look like zombies
 	sexes = 0
+	species_traits = list(SPECIES_ORGANIC)
 	meat = /obj/item/reagent_containers/food/snacks/meat/slab/human/mutant/zombie
 	mutanttongue = /obj/item/organ/tongue/zombie
 
diff --git a/code/modules/mob/living/carbon/life.dm b/code/modules/mob/living/carbon/life.dm
index 93e805c4b51..ae0ff5bb1c2 100644
--- a/code/modules/mob/living/carbon/life.dm
+++ b/code/modules/mob/living/carbon/life.dm
@@ -248,7 +248,7 @@
 		if(prob(D.infectivity))
 			D.spread()
 
-		if(stat != DEAD)
+		if(stat != DEAD && !D.process_dead)
 			D.stage_act()
 
 //todo generalize this and move hud out
diff --git a/tgstation.dme b/tgstation.dme
index 08ce4456331..254f9366ed0 100755
--- a/tgstation.dme
+++ b/tgstation.dme
@@ -348,6 +348,7 @@
 #include "code\datums\diseases\advance\symptoms\shivering.dm"
 #include "code\datums\diseases\advance\symptoms\skin.dm"
 #include "code\datums\diseases\advance\symptoms\sneeze.dm"
+#include "code\datums\diseases\advance\symptoms\species.dm"
 #include "code\datums\diseases\advance\symptoms\symptoms.dm"
 #include "code\datums\diseases\advance\symptoms\viral.dm"
 #include "code\datums\diseases\advance\symptoms\vision.dm"