diff --git a/baystation12.dme b/baystation12.dme
index 2e5479efa66..4665b2cf95d 100644
--- a/baystation12.dme
+++ b/baystation12.dme
@@ -1592,6 +1592,7 @@
 #include "code\modules\mob\living\simple_animal\friendly\lizard.dm"
 #include "code\modules\mob\living\simple_animal\friendly\mouse.dm"
 #include "code\modules\mob\living\simple_animal\friendly\mushroom.dm"
+#include "code\modules\mob\living\simple_animal\friendly\ratking.dm"
 #include "code\modules\mob\living\simple_animal\friendly\slime.dm"
 #include "code\modules\mob\living\simple_animal\friendly\spiderbot.dm"
 #include "code\modules\mob\living\simple_animal\friendly\tomato.dm"
diff --git a/code/global.dm b/code/global.dm
index 561da51effa..e4393e0466a 100644
--- a/code/global.dm
+++ b/code/global.dm
@@ -14,6 +14,7 @@ var/global/list/med_hud_users            = list() // List of all entities using
 var/global/list/sec_hud_users            = list() // List of all entities using a security HUD.
 var/global/list/hud_icon_reference       = list()
 var/global/list/janitorial_supplies      = list()	// List of all the janitorial supplies on the map that the PDA cart may be tracking.
+var/global/list/world_mouses 		 = list() //List of all mice in the world
 
 var/global/list/listening_objects         = list() // List of objects that need to be able to hear, used to avoid recursive searching through contents.
 
diff --git a/code/modules/mob/living/simple_animal/friendly/mouse.dm b/code/modules/mob/living/simple_animal/friendly/mouse.dm
index 95379c90a3a..99b2cb56b13 100644
--- a/code/modules/mob/living/simple_animal/friendly/mouse.dm
+++ b/code/modules/mob/living/simple_animal/friendly/mouse.dm
@@ -56,7 +56,6 @@
 
 	kitchen_tag = "rodent"
 
-
 /mob/living/simple_animal/mouse/Life()
 	if(..())
 
@@ -80,7 +79,12 @@
 	else
 		if ((world.time - timeofdeath) > decompose_time)
 			dust()
-
+			
+/mob/living/simple_animal/mouse/Destroy()
+	world_mouses -= src
+		
+	return ..()
+	
 //Pixel offsetting as they scamper around
 /mob/living/simple_animal/mouse/Move()
 	if(..())
@@ -120,6 +124,8 @@
 	//verbs += /mob/living/simple_animal/mouse/proc/squeak_soft
 	//verbs += /mob/living/simple_animal/mouse/proc/squeak_loud(1)
 
+	world_mouses += src
+
 /mob/living/simple_animal/mouse/speak_audio()
 	squeak_soft(0)
 
@@ -142,8 +148,6 @@
 	if(client)
 		client.time_died_as_mouse = world.time
 
-
-
 //Plays a sound.
 //This is triggered when a mob steps on an NPC mouse, or manually by a playermouse
 /mob/living/simple_animal/mouse/proc/squeak(var/manual = 1)
@@ -153,7 +157,6 @@
 			log_say("[key_name(src)] squeaks! ",ckey=key_name(src))
 
 
-
 //Plays a random selection of four sounds, at a low volume
 //This is triggered randomly periodically by any mouse, or manually
 /mob/living/simple_animal/mouse/proc/squeak_soft(var/manual = 1)
@@ -228,6 +231,18 @@
 				squeak(0)
 			else
 				squeak_loud(0)//You trod on its tail
+				
+	if(!health)
+		return
+
+	if(istype(AM,/mob/living/simple_animal/mouse/king))
+		var/mob/living/simple_animal/mouse/king/K = AM
+		if(!K.health)
+			return
+
+		src.visible_message("<span class='warning'>[src] joins the [K.swarm_name] of \the [K]</span>", \
+							"<span class='notice'>We join our brethren in \the [K.swarm_name]. Long live \the [K].</span>")
+		K.absorb(src)
 	..()
 
 /mob/living/simple_animal/mouse/death()
@@ -237,16 +252,15 @@
 
 	if(client)
 		client.time_died_as_mouse = world.time
+
+	world_mouses -= src
+
 	..()
 
 /mob/living/simple_animal/mouse/dust()
 	..(anim = "dust_[body_color]", remains = /obj/effect/decal/remains/mouse, iconfile = 'icons/mob/mouse.dmi')
 
 
-
-
-
-
 /*
  * Mouse types
  */
diff --git a/code/modules/mob/living/simple_animal/friendly/ratking.dm b/code/modules/mob/living/simple_animal/friendly/ratking.dm
new file mode 100644
index 00000000000..e2a998bb9bf
--- /dev/null
+++ b/code/modules/mob/living/simple_animal/friendly/ratking.dm
@@ -0,0 +1,278 @@
+#define RAT_MAYOR_LEVEL 1
+#define RAT_BARON_LEVEL 3
+#define RAT_DUKE_LEVEL 5
+#define RAT_KING_LEVEL 10
+#define RAT_EMPEROR_LEVEL 20
+#define RAT_SAVIOR_LEVEL 30
+#define RAT_GOD_LEVEL 50
+
+
+/proc/announceToRodents(var/message)
+	for(var/R in world_mouses)
+		R << message
+
+/mob/living/simple_animal/mouse/king
+	attacktext = "bitten"
+	a_intent = "harm"
+
+	icon_state = "mouse_gray"
+	item_state = "mouse_gray"
+	icon_living = "mouse_gray"
+	icon_dead = "mouse_gray_dead"
+	icon_rest = "mouse_gray_sleep"
+
+	var/swarm_name = "peasentry"
+	var/announce_name = "Request"
+	var/list/rats = list()
+
+/mob/living/simple_animal/mouse/king/New()
+	..()
+
+	update()
+
+	icon_state = initial(icon_state)
+	icon_living = initial(icon_living)
+	icon_dead = initial(icon_dead)
+	body_color = "gray"
+
+	say_dead_direct("An heir to the rat throne has risen, all rejoice and celebrate.")
+	announceToRodents("<span class='notice'>The rat king has risen! Go at once and join his kingdom, long live the king!</span>")
+
+/mob/living/simple_animal/mouse/king/death()
+	while(rats.len)
+		eject(rats[1], 1)
+
+	..()
+
+/mob/living/simple_animal/mouse/king/Move()
+	..()
+
+	for(var/image/I in overlays)
+		I.dir = src.dir
+
+/mob/living/simple_animal/mouse/king/proc/update_icon()
+	..()
+
+	src.overlays.Cut()
+
+	for(var/mob/living/simple_animal/mouse/R in rats)
+		var/image/rat_overlay = image('icons/mob/animal.dmi', "[R.icon_state]")
+		rat_overlay.dir = src.dir
+		var/matrix/M = matrix()
+		M.Translate(rand(-6, 6), rand(-4, 8))
+		rat_overlay.transform = M
+		src.overlays += rat_overlay
+
+/mob/living/simple_animal/mouse/king/proc/update()
+	if( rats.len >= RAT_GOD_LEVEL)
+		name = "rat god"
+		swarm_name = "creation"
+		announce_name = "Commandment"
+		desc = "A titanic swarm of rats."
+		attacktext = "swarmed"
+		melee_damage_lower = 15
+		melee_damage_upper = 20
+		maxHealth = 50
+		health = 50
+		mob_size = 10
+		universal_speak = 1
+	else if(rats.len >= RAT_SAVIOR_LEVEL)
+		name = "rat savior"
+		swarm_name = "flock"
+		announce_name = "Pronouncement"
+		desc = "A massive swarm of rats."
+		attacktext = "swarmed"
+		melee_damage_lower = 10
+		melee_damage_upper = 10
+		maxHealth = 40
+		health = 40
+		mob_size = 9
+	else if(rats.len >= RAT_EMPEROR_LEVEL)
+		name = "rat emperor"
+		swarm_name = "empire"
+		announce_name = "Command"
+		desc = "A large swarm of rats."
+		attacktext = "swarmed"
+		melee_damage_lower = 7
+		melee_damage_upper = 5
+		maxHealth = 35
+		health = 35
+		mob_size = 8
+	else if(rats.len >= RAT_KING_LEVEL)
+		name = "rat king"
+		swarm_name = "kingdom"
+		announce_name = "Decree"
+		desc = "A big swarm of rats."
+		attacktext = "swarmed"
+		melee_damage_lower = 5
+		melee_damage_upper = 5
+		maxHealth = 30
+		health = 30
+		mob_size = 7
+	else if(rats.len >= RAT_DUKE_LEVEL)
+		name = "rat duke"
+		swarm_name = "duchy"
+		announce_name = "Decree"
+		desc = "A swarm of rats."
+		attacktext = "bitten"
+		maxHealth = 25
+		health = 25
+		mob_size = 6
+	else if(rats.len >= RAT_BARON_LEVEL)
+		name = "rat baron"
+		swarm_name = "barony"
+		announce_name = "Decree"
+		desc = "A group of rats."
+		attacktext = "bitten"
+		maxHealth = 20
+		health = 20
+		mob_size = 4
+	else if(rats.len >= RAT_MAYOR_LEVEL)
+		name = "rat mayor"
+		swarm_name = "hamlet"
+		announce_name = "Decree"
+		desc = "A couple of rats."
+		attacktext = "bitten"
+		maxHealth = 15
+		health = 15
+		mob_size = 3
+	else
+		name = "rat peasant"
+		swarm_name = "peasentry"
+		announce_name = "Request"
+		desc = "A single rat. This one seems special."
+		attacktext = "scratched"
+		maxHealth = 10
+		health = 10
+		mob_size = 2
+
+	desc += " There are [rats.len] rats in his [swarm_name]."
+	real_name = name
+
+	update_icon()
+
+/mob/living/simple_animal/mouse/king/splat()
+	src.apply_damage(5, BRUTE)
+
+/mob/living/simple_animal/mouse/king/verb/kingDecree()
+	set category = "Abilities"
+	set name = "Decree"
+
+	if( !health )
+		usr << "<span class='notice'>You are dead, you cannot use any abilities!</span>"
+		return
+
+	var/input = sanitize(input(usr, "Please enter the [lowertext( announce_name )] for your whole kingdom.", "What?", "") as message|null, extra = 0)
+
+	if( !input )
+		return
+
+	var/full_message = {"<h2 class='alert'>[src]\'s [announce_name]</h2>
+<span class='alert'>[input]</span><br>"}
+
+	announceToRodents( "[full_message]" )
+
+/mob/living/simple_animal/mouse/king/verb/roar()
+	set category = "Abilities"
+	set name = "Mighty Roar"
+
+	if(!health)
+		usr << "<span class='notice'>You are dead, you cannot use any abilities!</span>"
+		return
+
+	if(last_special > world.time)
+		usr << "<span class='warning'>We must wait a little while before we can use this ability again!</span>"
+		return
+
+	if(!canRoar())
+		usr << "<span class='warning'>Our [swarm_name] must grow larger before we can use this ability!</span>"
+		return
+
+	src.visible_message("<span class='warning'>[src] lets loose a mighty roar!</span>")
+	for( var/obj/machinery/light/L in range( 3, src ))
+		if( canRoarBreakLights() && prob(( rats.len/RAT_EMPEROR_LEVEL )*100 ))
+			L.broken()
+		else
+			L.flicker()
+	last_special = world.time + 30
+
+/mob/living/simple_animal/mouse/king/verb/devourdead(mob/target as mob in oview())
+	set category = "Abilities"
+	set name = "Devour Body"
+
+	if(!Adjacent(target))
+		return
+
+	if(!health)
+		usr << "<span class='notice'>You are dead, you cannot use any abilities!</span>"
+		return
+
+	if(!canEatCorpse())
+		usr << "<span class='warning'>Our [swarm_name] must grow larger before we can use this ability!</span>"
+		return
+
+	if(last_special > world.time)
+		usr << "<span class='warning'>We must wait a little while before we can use this ability again!</span>"
+		return
+
+	if(target.stat != DEAD)
+		usr << "<span class='warning'>We can only devour the dead!</span>"
+		return
+
+	usr.visible_message("<span class='danger'>\The [usr] swarms the body of \the [target], ripping flesh from bone!</span>" )
+
+	if(!do_after(usr,200))
+		usr<< "<span class='warning'>You need to wait longer to consume the body of [target]!</span>"
+		return 0
+
+	src.visible_message("<span class='danger'>\The [usr] consumed the body of \the [target]!</span>")
+	target.gib()
+	rejuvenate()
+	updatehealth()
+	last_special = world.time + 100
+	return
+
+/mob/living/simple_animal/mouse/king/proc/absorb(var/mob/living/simple_animal/mouse/R, var/update = 1)
+	if(!(R in rats))
+		R.forceMove(src)
+		rats += R
+
+	if( update )
+		update()
+
+/mob/living/simple_animal/mouse/king/proc/eject(var/mob/living/simple_animal/mouse/R, var/update = 1)
+	if(R in rats)
+		R.forceMove(get_turf(src))
+		rats -= R
+
+	if(update)
+		update()
+
+/mob/living/simple_animal/mouse/king/proc/kingdomMessage(var/message, var/king_message)
+	for(var/R in rats)
+		R << message
+
+	if(king_message)
+		src << king_message
+	else
+		src << message
+
+/mob/living/simple_animal/mouse/king/proc/canNibbleWire()
+	if(rats.len >= RAT_MAYOR_LEVEL)
+		return 1
+	return 0
+
+/mob/living/simple_animal/mouse/king/proc/canRoar()
+	if(rats.len >= RAT_BARON_LEVEL)
+		return 1
+	return 0
+
+/mob/living/simple_animal/mouse/king/proc/canRoarBreakLights()
+	if(rats.len >= RAT_EMPEROR_LEVEL)
+		return 1
+	return 0
+
+/mob/living/simple_animal/mouse/king/proc/canEatCorpse()
+	if(rats.len >= RAT_KING_LEVEL)
+		return 1
+	return 0
diff --git a/code/modules/ventcrawl/ventcrawl.dm b/code/modules/ventcrawl/ventcrawl.dm
index 6bc2058eb55..f377bae3d93 100644
--- a/code/modules/ventcrawl/ventcrawl.dm
+++ b/code/modules/ventcrawl/ventcrawl.dm
@@ -10,7 +10,8 @@ var/global/list/can_enter_vent_with = list(
 	/obj/item/device/radio/borg,
 	/obj/item/weapon/holder,
 	/obj/machinery/camera,
-	/mob/living/simple_animal/borer
+	/mob/living/simple_animal/borer,
+	/mob/living/simple_animal/mouse
 	)
 
 /mob/living/var/list/icon/pipes_shown = list()