Okay, feature done

code/modules/reagents/chemistry/holder.dm

@@ -550,6 +550,10 @@
 	if (multiplier == 0)
 		fermiEnd()
 		return
+	for(var/P in C.required_catalysts)
+		if(!has_reagent(P))
+			fermiEnd()
+			return
 	for(var/P in cached_results)
 		targetVol = cached_results[P]*multiplier
 
@@ -676,7 +680,7 @@
 					STOP_PROCESSING(SSprocessing, src)
 					return 0
 
-	C.FermiCreate(src)//proc that calls when step is done
+	C.FermiCreate(src, addChemAmmount, purity)//proc that calls when step is done
 
 	//Apply pH changes and thermal output of reaction to beaker
 	chem_temp = round(cached_temp + (C.ThermicConstant * addChemAmmount))

code/modules/reagents/chemistry/recipes/medicine.dm

@@ -68,6 +68,41 @@
 	results = list("synthflesh" = 3)
 	required_reagents = list("blood" = 1, "carbon" = 1, "styptic_powder" = 1)
 
+/datum/chemical_reaction/synthtissue
+	name = "Synthtissue"
+	id = "synthtissue"
+	results = list("synthtissue" = 0.05)
+	required_reagents = list("synthflesh" = 0.01)
+	required_catalysts = list("nutriment" = 0.1)
+	//FermiChem vars:
+	OptimalTempMin 		= 305		// Lower area of bell curve for determining heat based rate reactions
+	OptimalTempMax 		= 315 		// Upper end for above
+	ExplodeTemp 		= 1050 		// Temperature at which reaction explodes
+	OptimalpHMin 		= 9 		// Lowest value of pH determining pH a 1 value for pH based rate reactions (Plateu phase)
+	OptimalpHMax 		= 9.5 		// Higest value for above
+	ReactpHLim 			= 2 		// How far out pH wil react, giving impurity place (Exponential phase)
+	CatalystFact 		= 0 		// How much the catalyst affects the reaction (0 = no catalyst)
+	CurveSharpT 		= 2.5 		// How sharp the temperature exponential curve is (to the power of value)
+	CurveSharppH 		= 2.5 		// How sharp the pH exponential curve is (to the power of value)
+	ThermicConstant		= 0.01 		// Temperature change per 1u produced
+	HIonRelease 		= 0.01 		// pH change per 1u reaction (inverse for some reason)
+	RateUpLim 			= 0.02 		// Optimal/max rate possible if all conditions are perfect
+	FermiChem 			= TRUE		// If the chemical uses the Fermichem reaction mechanics
+	PurityMin 			= 0
+
+/datum/chemical_reaction/synthtissue/FermiCreate(datum/reagents/holder, added_volume, added_purity)
+	var/datum/reagent/St = holder.has_reagent("synthtissue")
+	var/datum/reagent/N = holder.has_reagent("nutriment")
+	if(!St)
+		return
+	if(holder.chem_temp > 320)
+		var/temp_ratio = 1-(330 - holder.chem_temp)/10
+		holder.remove_reagent(src.id, added_volume*temp_ratio)
+	if(St.purity < 1)
+		St.volume *= St.purity
+		St.purity = 1
+	N.volume -= 0.002
+
 /datum/chemical_reaction/styptic_powder
 	name = "Styptic Powder"
 	id = "styptic_powder"

code/modules/surgery/organs/tongue.dm

@@ -30,19 +30,25 @@
 
 /obj/item/organ/tongue/proc/handle_speech(datum/source, list/speech_args)
 
-/obj/item/organ/tongue/onDamage(damage_mod)
-	if (maxHealth == "alien")
-		return
+/obj/item/organ/tongue/applyOrganDamage(var/d, var/maximum = maxHealth)
 	if (maxHealth == "bone")
+		if(owner)
+			return
 		var/target = owner.get_bodypart(BODY_ZONE_HEAD)
-		owner.apply_damage(damage_mod, BURN, target)
-		to_chat(owner, "<span class='userdanger'>The drink burns your skull! Oof, your bones!</span>")
-		return
-	if(damage+damage_mod < 0)
-		damage = 0
+		owner.apply_damage(d, BURN, target)
+		to_chat(owner, "<span class='userdanger'>You feel your skull burning! Oof, your bones!</span>")
 		return
 
-	damage += damage_mod
+	if(!d) //Micro-optimization.
+		return
+	if(maximum < damage)
+		return
+	damage = CLAMP(damage + d, 0, maximum)
+	var/mess = check_damage_thresholds(owner)
+	prev_damage = damage
+	if(mess && owner)
+		to_chat(owner, mess)
+
 	if ((damage / maxHealth) > 1)
 		to_chat(owner, "<span class='userdanger'>Your tongue is singed beyond recognition, and disintegrates!</span>")
 		SSblackbox.record_feedback("tally", "fermi_chem", 1, "Tongues lost to Fermi")
@@ -167,7 +173,7 @@
 	icon_state = "tonguexeno"
 	say_mod = "hisses"
 	taste_sensitivity = 10 // LIZARDS ARE ALIENS CONFIRMED
-	maxHealth = "alien" //Their blood is acid, so, no, though a tongueless xeno might be funny
+	maxHealth = 500 //They've a little mouth for a tongue, so it's pretty rhobust
 	modifies_speech = TRUE // not really, they just hiss
 	var/static/list/languages_possible_alien = typecacheof(list(
 		/datum/language/xenocommon,