Radiotrophic Metabolism mutation

Added the Radiotrophic Metabolism mutation, makes a character gain fat over time (stronger if they are irradiated) and become immune to the adverse effects of radiations

GainStation13/code/datums/mutations/radfat.dm

@@ -0,0 +1,42 @@
+/datum/mutation/human/radfat
+	name = "Radiotrophic Metabolism"
+	desc = "A mutation that causes the user to be immune to the adverse effects of radiations, but causes sudden cell multiplication with increased strength under irradiation."
+	quality = POSITIVE
+	text_gain_indication = "<span class='notice'>You crave the taste of... radiation?</span>"
+	text_lose_indication = "<span class='notice'>You no longer desire the taste of radiation...</span>"
+	difficulty = 14
+	instability = 30
+	power_coeff = 1
+
+	var/FATCAP = 100
+
+/datum/mutation/human/radfat/on_life()
+	. = ..()
+	var/fat_add = 1
+	var/pwr = GET_MUTATION_POWER(src)
+	if(owner.radiation > 0)
+		fat_add += round(owner.radiation * (0.10 * pwr))
+		owner.radiation -= round(owner.radiation * 0.05) + 1
+		if(fat_add > (FATCAP * pwr))
+			fat_add = (FATCAP * pwr)
+	owner.adjust_fatness(fat_add, FATTENING_TYPE_RADIATIONS)
+
+/datum/mutation/human/radfat/on_acquiring(mob/living/carbon/human/owner)
+	if(..())
+		return
+	ADD_TRAIT(owner, TRAIT_RADRESONANCE, src)
+
+/datum/mutation/human/radfat/on_losing(mob/living/carbon/human/owner)
+	if(..())
+		return
+	REMOVE_TRAIT(owner, TRAIT_RADRESONANCE, src)
+
+/obj/item/dnainjector/antiradfat
+	name = "\improper DNA injector (Anti-Radiotrophic Metabolism)"
+	desc = "The green kills."
+	remove_mutations = list(RADFAT)
+
+/obj/item/dnainjector/radfat
+	name = "\improper DNA injector (Radiotrophic Metabolism)"
+	desc = "Nuclear fallout protection at an heavy price."
+	add_mutations = list(RADFAT)

code/__DEFINES/DNA.dm

@@ -43,6 +43,7 @@
 #define PARANOIA	/datum/mutation/human/paranoia
 #define MINDREAD	/datum/mutation/human/mindreader
 #define FATFANG		/datum/mutation/human/fatfang
+#define RADFAT		/datum/mutation/human/radfat
 
 #define UI_CHANGED "ui changed"
 #define UE_CHANGED "ue changed"

code/__DEFINES/misc.dm

@@ -530,6 +530,7 @@ GLOBAL_LIST_INIT(lighter_reskins, list(ZIPPO_SKIN_PLAIN = "plain", ZIPPO_SKIN_DA
 #define FATTENING_TYPE_MAGIC "magic"
 #define FATTENING_TYPE_VIRUS "virus"
 #define FATTENING_TYPE_NANITES "nanites"
+#define FATTENING_TYPE_RADIATIONS "radiations"
 #define FATTENING_TYPE_WEIGHT_LOSS "weight_loss"
 
 #define FATNESS_TO_WEIGHT_RATIO 0.25

tgstation.dme

@@ -3081,6 +3081,7 @@
 #include "GainStation13\code\datums\components\fattening_door.dm"
 #include "GainStation13\code\datums\diseases\advance\symptoms\berry.dm"
 #include "GainStation13\code\datums\mutations\fatfang.dm"
+#include "GainStation13\code\datums\mutations\radfat.dm"
 #include "GainStation13\code\datums\status_effects\fatstun.dm"
 #include "GainStation13\code\game\lore_papers.dm"
 #include "GainStation13\code\game\sound.dm"