I missed an earlier port.

code/modules/mob/living/brain/MMI.dm

@@ -57,7 +57,7 @@
 		newbrain.brainmob = null
 		brainmob.forceMove(src)
 		brainmob.container = src
-		if(!newbrain.damaged_brain) // the brain organ hasn't been beaten to death.
+		if(!newbrain.organ_flags & ORGAN_FAILING) // the brain organ hasn't been beaten to death.
 			brainmob.stat = CONSCIOUS //we manually revive the brain mob
 			GLOB.dead_mob_list -= brainmob
 			GLOB.alive_mob_list += brainmob

code/modules/mob/living/brain/brain_item.dm

@@ -7,11 +7,19 @@
 	layer = ABOVE_MOB_LAYER
 	zone = BODY_ZONE_HEAD
 	slot = ORGAN_SLOT_BRAIN
-	vital = TRUE
+	organ_flags |= ORGAN_VITAL
 	attack_verb = list("attacked", "slapped", "whacked")
+	///The brain's organ variables are significantly more different than the other organs, with half the decay rate for balance reasons, and twice the maxHealth
+	decay_factor = STANDARD_ORGAN_DECAY	/ 2		//30 minutes of decaying to result in a fully damaged brain, since a fast decay rate would be unfun gameplay-wise
+
+	maxHealth	= BRAIN_DAMAGE_DEATH
+	low_threshold = 45
+	high_threshold = 120
 	var/mob/living/brain/brainmob = null
-	var/damaged_brain = FALSE //whether the brain organ is damaged.
+	var/organ_flags & ORGAN_FAILING = FALSE //whether the brain organ is damaged.
 	var/decoy_override = FALSE	//I apologize to the security players, and myself, who abused this, but this is going to go.
+	//two variables necessary for calculating whether we get a brain trauma or not
+	var/damage_delta = 0
 
 	var/list/datum/brain_trauma/traumas = list()
 
@@ -90,22 +98,88 @@
 	if(brainmob)
 		O.attack(brainmob, user) //Oh noooeeeee
 
-/obj/item/organ/brain/examine(mob/user)
-	..()
+	if(istype(O, /obj/item/organ_storage)) //BUG_PROBABLE_CAUSE
+		return //Borg organ bags shouldn't be killing brains
 
-	if(brainmob)
-		if(brainmob.client)
-			if(brainmob.health <= HEALTH_THRESHOLD_DEAD)
-				to_chat(user, "It's lifeless and severely damaged.")
+	if((organ_flags & ORGAN_FAILING) && O.is_drainable() && O.reagents.has_reagent("neurine")) //Neurine fixes dead brains
+		. = TRUE //don't do attack animation.
+		var/cached_Bdamage = brainmob?.health 
+		var/datum/reagent/medicine/neurine/N = reagents.has_reagent("neurine")
+
+		if(O.reagents.has_reagent("mannitol")//Just a quick way to bolster the effects if someone mixes up a batch.
+			N.volume *= 1.5
+
+		if(!O.reagents.has_reagent("neurine", 10))
+			to_chat(user, "<span class='warning'>There's not enough neurine in [O] to restore [src]!</span>")
+			return
+		
+		user.visible_message("<span class='notice'>[user] starts to pour the contents of [O] onto [src].</span>", "<span class='notice'>You start to slowly pour the contents of [O] onto [src].</span>")
+		if(!do_after(user, 60, TRUE, src))
+			to_chat(user, "<span class='warning'>You failed to pour [O] onto [src]!</span>")
+			return
+
+		user.visible_message("<span class='notice'>[user] pours the contents of [O] onto [src], causing it to reform its original shape and turn a slightly brighter shade of pink.</span>", "<span class='notice'>You pour the contents of [O] onto [src], causing it to reform its original shape and turn a slightly brighter shade of pink.</span>")
+		setOrganDamage((damage - (0.10 * maxHealth)*N.volume))	//heals a small amount, and by using "setorgandamage", we clear the failing variable if that was up
+		O.reagents.clear_reagents()
+
+		if(cached_Bdamage) //Fixing dead brains yeilds a trauma
+			if(cached_Bdamage <= HEALTH_THRESHOLD_DEAD && brainmob.health > HEALTH_THRESHOLD_DEAD)
+				if(prob(90))
+					gain_trauma_type(BRAIN_TRAUMA_MILD)
+				if else(prob(50))
+					gain_trauma_type(BRAIN_TRAUMA_SEVERE)
+				else
+					gain_trauma_type(BRAIN_TRAUMA_SPECIAL)
+		return
+
+	if((organ_flags & ORGAN_FAILING) && O.is_drainable() && O.reagents.has_reagent("mannitol")) //attempt to heal the brain
+		. = TRUE //don't do attack animation.
+		var/datum/reagent/medicine/mannitol/M = reagents.has_reagent("mannitol")
+		if(brain_death || brainmob?.health <= HEALTH_THRESHOLD_DEAD) //if the brain is fucked anyway, do nothing
+				to_chat(user, "<span class='warning'>[src] is far too damaged, you'll have to use neurine on it!</span>")
+				return
+
+		if(!O.reagents.has_reagent("mannitol", 10))
+			to_chat(user, "<span class='warning'>There's not enough mannitol in [O] to restore [src]!</span>")
+			return
+
+		user.visible_message("<span class='notice'>[user] starts to pour the contents of [O] onto [src].</span>", "<span class='notice'>You start to slowly pour the contents of [O] onto [src].</span>")
+		if(!do_after(user, 60, TRUE, src))
+			to_chat(user, "<span class='warning'>You failed to pour [O] onto [src]!</span>")
+			return
+
+		user.visible_message("<span class='notice'>[user] pours the contents of [O] onto [src], causing it to reform its original shape and turn a slightly brighter shade of pink.</span>", "<span class='notice'>You pour the contents of [O] onto [src], causing it to reform its original shape and turn a slightly brighter shade of pink.</span>")
+		setOrganDamage((damage - (0.05 * maxHealth)*M.volume))	//heals a small amount, and by using "setorgandamage", we clear the failing variable if that was up
+		O.reagents.clear_reagents()
+		return
+	
+
+
+/obj/item/organ/brain/examine(mob/user)//BUG_PROBABLE_CAUSE to_chats changed to . += 
+	. = ..()
+
+	if(suicided)
+		. += "<span class='info'>It's started turning slightly grey. They must not have been able to handle the stress of it all.</span>"
+	else if(brainmob)
+		if(brainmob.get_ghost(FALSE, TRUE))
+			if(brain_death || brainmob.health <= HEALTH_THRESHOLD_DEAD)
+				. += "<span class='info'>It's lifeless and severely damaged, only the strongest of chems will save it.</span>"
+			else if(organ_flags & ORGAN_FAILING)
+				. += "<span class='info'>It seems to still have a bit of energy within it, but it's rather damaged... You may be able to restore it with some <b>mannitol</b>.</span>"
 			else
-				to_chat(user, "You can feel the small spark of life still left in this one.")
+				. += "<span class='info'>You can feel the small spark of life still left in this one.</span>"
+		else if(organ_flags & ORGAN_FAILING)
+			. += "<span class='info'>It seems particularly lifeless and is rather damaged... You may be able to restore it with some <b>mannitol</b> incase it becomes functional again later.</span>"
 		else
-			to_chat(user, "This one seems particularly lifeless. Perhaps it will regain some of its luster later.")
+			. += "<span class='info'>This one seems particularly lifeless. Perhaps it will regain some of its luster later.</span>"
 	else
 		if(decoy_override)
-			to_chat(user, "This one seems particularly lifeless. Perhaps it will regain some of its luster later.")
+			if(organ_flags & ORGAN_FAILING)
+				. += "<span class='info'>It seems particularly lifeless and is rather damaged... You may be able to restore it with some <b>mannitol</b> incase it becomes functional again later.</span>"
+			else
+				. += "<span class='info'>This one seems particularly lifeless. Perhaps it will regain some of its luster later.</span>"
 		else
-			to_chat(user, "This one is completely devoid of life.")
+			. += "<span class='info'>This one is completely devoid of life.</span>"
 
 /obj/item/organ/brain/attack(mob/living/carbon/C, mob/user)
 	if(!istype(C))
@@ -141,7 +215,7 @@
 		Insert(C)
 	else
 		..()
-
+/* TO BE REMOVED, KEPT IN CASE OF BUGS
 /obj/item/organ/brain/proc/get_brain_damage()
 	var/brain_damage_threshold = max_integrity * BRAIN_DAMAGE_INTEGRITY_MULTIPLIER
 	var/offset_integrity = obj_integrity - (max_integrity - brain_damage_threshold)
@@ -165,6 +239,42 @@
 		else if(adjusted_amount <= -DAMAGE_PRECISION)
 			obj_integrity = min(max_integrity, obj_integrity-adjusted_amount)
 	. = adjusted_amount
+*/
+
+/obj/item/organ/brain/on_life()
+	if(damage >= BRAIN_DAMAGE_DEATH) //rip
+		to_chat(owner, "<span class='userdanger'>The last spark of life in your brain fizzles out...</span>")
+		owner.death()
+		brain_death = TRUE
+
+/obj/item/organ/brain/process()	//needs to run in life AND death
+	..()
+	//if we're not more injured than before, return without gambling for a trauma
+	if(damage <= prev_damage)
+		prev_damage = damage
+		return
+	damage_delta = damage - prev_damage
+	if(damage > BRAIN_DAMAGE_MILD)
+		if(prob(damage_delta * (1 + max(0, (damage - BRAIN_DAMAGE_MILD)/100)))) //Base chance is the hit damage; for every point of damage past the threshold the chance is increased by 1% //learn how to do your bloody math properly goddamnit
+			gain_trauma_type(BRAIN_TRAUMA_MILD)
+	if(damage > BRAIN_DAMAGE_SEVERE)
+		if(prob(damage_delta * (1 + max(0, (damage - BRAIN_DAMAGE_SEVERE)/100)))) //Base chance is the hit damage; for every point of damage past the threshold the chance is increased by 1%
+			if(prob(20))
+				gain_trauma_type(BRAIN_TRAUMA_SPECIAL)
+			else
+				gain_trauma_type(BRAIN_TRAUMA_SEVERE)
+
+	if (owner)
+		if(owner.stat < UNCONSCIOUS) //conscious or soft-crit
+			if(prev_damage < BRAIN_DAMAGE_MILD && damage >= BRAIN_DAMAGE_MILD)
+				to_chat(owner, "<span class='warning'>You feel lightheaded.</span>")
+			else if(prev_damage < BRAIN_DAMAGE_SEVERE && damage >= BRAIN_DAMAGE_SEVERE)
+				to_chat(owner, "<span class='warning'>You feel less in control of your thoughts.</span>")
+			else if(prev_damage < (BRAIN_DAMAGE_DEATH - 20) && damage >= (BRAIN_DAMAGE_DEATH - 20))
+				to_chat(owner, "<span class='warning'>You can feel your mind flickering on and off...</span>")
+	//update our previous damage holder after we've checked our boundaries
+	prev_damage = damage
+	return
 
 /obj/item/organ/brain/Destroy() //copypasted from MMIs.
 	if(brainmob)

code/modules/mob/living/brain/life.dm

@@ -20,7 +20,7 @@
 		else if(istype(loc, /obj/item/organ/brain))
 			BR = loc
 		if(BR)
-			BR.damaged_brain = 1 //beaten to a pulp
+			BR.organ_flags & ORGAN_FAILING = 1 //beaten to a pulp
 
 /mob/living/brain/proc/handle_emp_damage()
 	if(emp_damage)