Adds adrenaline to combat

code/modules/reagents/chemistry/reagents/other_reagents.dm

@@ -2098,3 +2098,17 @@
 /datum/reagent/plaguebacteria/reaction_mob(mob/living/L, method = TOUCH, reac_volume, show_message = TRUE, touch_protection = FALSE)
 	if(method == INGEST || method == TOUCH || method == INJECT)
 		L.ForceContractDisease(new /datum/disease/plague(), FALSE, TRUE)
+
+/datum/reagent/adrenaline
+	name = "Adrenaline"
+	description = "Powerful chemical that termporarily makes the user immune to slowdowns"
+	color = "#d1cd9a"
+	can_synth = FALSE
+
+/datum/reagent/adrenaline/on_mob_add(mob/living/L)
+	. = ..()
+	ADD_TRAIT(L, TRAIT_IGNOREDAMAGESLOWDOWN, type)
+
+/datum/reagent/adrenaline/on_mob_delete(mob/living/L)
+	. = ..()
+	REMOVE_TRAIT(L, TRAIT_IGNOREDAMAGESLOWDOWN, type)

code/modules/surgery/organs/heart.dm

@@ -1,3 +1,5 @@
+#define ADRENALINE_THRESHOLD 15
+
 /obj/item/organ/heart
 	name = "heart"
 	desc = "I feel bad for the heartless bastard who lost this."
@@ -19,6 +21,8 @@
 	var/beat = BEAT_NONE//is this mob having a heatbeat sound played? if so, which?
 	var/failed = FALSE		//to prevent constantly running failing code
 	var/operated = FALSE	//whether the heart's been operated on to fix some of its damages
+	var/lasthealth
+	COOLDOWN_DECLARE(adrenal_cooldown)
 
 /obj/item/organ/heart/Initialize()
 	. = ..()
@@ -70,7 +74,10 @@
 		var/sound/slowbeat = sound('sound/health/slowbeat.ogg', repeat = TRUE)
 		var/sound/fastbeat = sound('sound/health/fastbeat.ogg', repeat = TRUE)
 		var/mob/living/carbon/H = owner
-
+		if(COOLDOWN_FINISHED(src, adrenal_cooldown) && ((H.health+ADRENALINE_THRESHOLD) < lasthealth))
+			H.reagents.add_reagent(/datum/reagent/adrenaline, 5)
+			COOLDOWN_START(src, adrenal_cooldown, 10 MINUTES)
+		lasthealth = H.health
 
 		if(H.health <= H.crit_threshold && beat != BEAT_SLOW)
 			beat = BEAT_SLOW