New Healer Drone Ability: Sacrifice, another go

code/modules/mob/living/carbon/xenomorph/abilities/general_abilities.dm

@@ -422,7 +422,7 @@
 	action_type = XENO_ACTION_CLICK
 	ability_primacy = XENO_PRIMARY_ACTION_5
 
-/datum/action/xeno_action/activable/place_construction/queen_macro //so it doesn't screw other macros up
+/datum/action/xeno_action/activable/place_construction/not_primary //so it doesn't screw other macros up
 	ability_primacy = XENO_NOT_PRIMARY_ACTION
 
 /datum/action/xeno_action/activable/xeno_spit

code/modules/mob/living/carbon/xenomorph/castes/Queen.dm

@@ -288,7 +288,7 @@
 		/datum/action/xeno_action/onclick/regurgitate,
 		/datum/action/xeno_action/watch_xeno,
 		/datum/action/xeno_action/activable/tail_stab,
-		/datum/action/xeno_action/activable/place_construction/queen_macro, //normally fifth macro but not as important for queen
+		/datum/action/xeno_action/activable/place_construction/not_primary, //normally fifth macro but not as important for queen
 		/datum/action/xeno_action/activable/corrosive_acid,
 		/datum/action/xeno_action/onclick/emit_pheromones,
 		/datum/action/xeno_action/onclick/queen_word,
@@ -321,7 +321,7 @@
 		/datum/action/xeno_action/onclick/regurgitate,
 		/datum/action/xeno_action/watch_xeno,
 		/datum/action/xeno_action/activable/tail_stab,
-		/datum/action/xeno_action/activable/place_construction/queen_macro, //normally fifth macro but not as important for queen
+		/datum/action/xeno_action/activable/place_construction/not_primary, //normally fifth macro but not as important for queen
 		/datum/action/xeno_action/activable/corrosive_acid,
 		/datum/action/xeno_action/onclick/emit_pheromones,
 		/datum/action/xeno_action/onclick/queen_word,
@@ -816,7 +816,7 @@
 		// These already have their placement locked in:
 		/datum/action/xeno_action/onclick/regurgitate,
 		/datum/action/xeno_action/watch_xeno,
-		/datum/action/xeno_action/activable/place_construction/queen_macro,
+		/datum/action/xeno_action/activable/place_construction/not_primary,
 		/datum/action/xeno_action/onclick/emit_pheromones,
 		/datum/action/xeno_action/onclick/queen_word,
 		/datum/action/xeno_action/onclick/psychic_whisper,

code/modules/mob/living/carbon/xenomorph/mutators/strains/drone/healer.dm

@@ -9,11 +9,16 @@
 		/datum/action/xeno_action/activable/secrete_resin,
 		/datum/action/xeno_action/onclick/choose_resin,
 		/datum/action/xeno_action/activable/transfer_plasma,
+		/datum/action/xeno_action/activable/place_construction, // so it doesn't use fifth macro
+		/datum/action/xeno_action/onclick/plant_weeds, // so it doesn't break order
 	)
 	mutator_actions_to_add = list(
+		/datum/action/xeno_action/activable/place_construction/not_primary, // so it doesn't use fifth macro
+		/datum/action/xeno_action/onclick/plant_weeds, // so it doesn't break order
 		/datum/action/xeno_action/onclick/plant_resin_fruit, // Second macro. Resin fruits belong to Gardener, but Healer has a minor variant.
 		/datum/action/xeno_action/activable/apply_salve, //Third macro, heal over time ability.
 		/datum/action/xeno_action/activable/transfer_plasma/healer, //Fourth macro, an improved plasma transfer.
+		/datum/action/xeno_action/activable/healer_sacrifice, //Fifth macro, the ultimate ability to sacrifice yourself
 	)
 	keystone = TRUE
 	behavior_delegate_type = /datum/behavior_delegate/drone_healer
@@ -137,8 +142,10 @@
 	to_chat(target_xeno, SPAN_XENOWARNING("[src] covers your wounds with a regenerative resin salve. You feel reinvigorated!"))
 	to_chat(src, SPAN_XENOWARNING("You regurgitate your vital fluids and some plasma to create a regenerative resin salve and apply it to [target_xeno]'s wounds. You feel weakened..."))
 	playsound(src, "alien_drool", 25)
-	var/datum/behavior_delegate/drone_healer/healer_delegate = src.behavior_delegate
+	var/datum/behavior_delegate/drone_healer/healer_delegate = behavior_delegate
 	healer_delegate.salve_applied_recently = TRUE
+	if(target_xeno.mutation_type != DRONE_HEALER && !isfacehugger(target_xeno)) // no cheap grinding
+		healer_delegate.modify_transferred(amount * damage_taken_mod)
 	update_icons()
 	addtimer(CALLBACK(healer_delegate, /datum/behavior_delegate/drone_healer/proc/un_salve), 10 SECONDS, TIMER_OVERRIDE|TIMER_UNIQUE)
 
@@ -148,6 +155,9 @@
 	var/salve_applied_recently = FALSE
 	var/mutable_appearance/salve_applied_icon
 
+	var/transferred_amount = 0
+	var/required_transferred_amount = 7500
+
 /datum/behavior_delegate/drone_healer/on_update_icons()
 	if(!salve_applied_icon)
 		salve_applied_icon = mutable_appearance('icons/mob/xenos/drone_strain_overlays.dmi',"Healer Drone Walking")
@@ -173,3 +183,122 @@
 /datum/behavior_delegate/drone_healer/proc/un_salve()
 	salve_applied_recently = FALSE
 	bound_xeno.update_icons()
+
+/*
+	SACRIFICE
+*/
+
+/datum/behavior_delegate/drone_healer/proc/modify_transferred(amount)
+	transferred_amount += amount
+
+/datum/behavior_delegate/drone_healer/append_to_stat()
+	. = list()
+	. += "Transferred health amount: [transferred_amount]/[required_transferred_amount]"
+	if(transferred_amount >= required_transferred_amount)
+		. += "Sacrifice will grant you new life."
+
+/datum/behavior_delegate/drone_healer/on_life()
+	if(!bound_xeno)
+		return
+	if(bound_xeno.stat == DEAD)
+		return
+	var/image/holder = bound_xeno.hud_list[PLASMA_HUD]
+	holder.overlays.Cut()
+	var/percentage_transferred = min(round((transferred_amount / required_transferred_amount) * 100, 10), 100)
+	if(percentage_transferred)
+		holder.overlays += image('icons/mob/hud/hud.dmi', "xenoenergy[percentage_transferred]")
+
+/datum/behavior_delegate/drone_healer/handle_death(mob/M)
+	var/image/holder = bound_xeno.hud_list[PLASMA_HUD]
+	holder.overlays.Cut()
+
+/datum/action/xeno_action/activable/healer_sacrifice
+	name = "Sacrifice"
+	action_icon_state = "screech"
+	ability_name = "sacrifice"
+	var/max_range = 1
+	var/transfer_mod = 0.75 // only transfers 75% of current healer's health
+	macro_path = /datum/action/xeno_action/verb/verb_healer_sacrifice
+	action_type = XENO_ACTION_CLICK
+	ability_primacy = XENO_PRIMARY_ACTION_5
+
+/datum/action/xeno_action/verb/verb_healer_sacrifice()
+	set category = "Alien"
+	set name = "Sacrifice"
+	set hidden = TRUE
+	var/action_name = "Sacrifice"
+	handle_xeno_macro(src, action_name)
+
+/datum/action/xeno_action/activable/healer_sacrifice/use_ability(atom/atom)
+	var/mob/living/carbon/xenomorph/xeno = owner
+	var/mob/living/carbon/xenomorph/target = atom
+
+	if(!istype(target))
+		return
+
+	if(target == xeno)
+		to_chat(xeno, "We can't heal ourself!")
+		return
+
+	if(isfacehugger(target) || islesserdrone(target))
+		to_chat(xeno, "It would be a waste...")
+		return
+
+	if(!xeno.check_state())
+		return
+
+	if(!xeno.can_not_harm(target)) //so we can heal only allies
+		to_chat(xeno, SPAN_WARNING("[target] is an enemy of our hive!"))
+		return
+
+	if(target.stat == DEAD)
+		to_chat(xeno, SPAN_WARNING("[target] is already dead!"))
+		return
+
+	if(target.health >= target.maxHealth)
+		to_chat(xeno, SPAN_WARNING("[target] is already at max health!"))
+		return
+
+	if(!isturf(xeno.loc))
+		to_chat(xeno, SPAN_WARNING("We cannot transfer health from here!"))
+		return
+
+	if(get_dist(xeno, target) > max_range)
+		to_chat(xeno, SPAN_WARNING("We need to be closer to [target]."))
+		return
+
+	xeno.say(";MY LIFE FOR THE QUEEN!!!")
+
+	target.gain_health(xeno.health * transfer_mod)
+	target.updatehealth()
+
+	target.xeno_jitter(1 SECONDS)
+	target.flick_heal_overlay(3 SECONDS, "#44253d")
+
+	target.visible_message(SPAN_XENONOTICE("[xeno] explodes in a deluge of regenerative resin salve, covering [target] in it!"))
+	xeno_message(SPAN_XENOANNOUNCE("[xeno] sacrifices itself to heal [target]!"), 2, target.hive.hivenumber)
+
+	var/datum/behavior_delegate/drone_healer/behavior_delegate = xeno.behavior_delegate
+	if(istype(behavior_delegate) && behavior_delegate.transferred_amount >= behavior_delegate.required_transferred_amount && xeno.client && xeno.hive)
+		var/datum/hive_status/hive_status = xeno.hive
+		var/turf/spawning_turf = get_turf(xeno)
+		if(!hive_status.hive_location)
+			addtimer(CALLBACK(xeno.hive, TYPE_PROC_REF(/datum/hive_status, respawn_on_turf), xeno.client, spawning_turf), 0.5 SECONDS)
+		else
+			addtimer(CALLBACK(xeno.hive, TYPE_PROC_REF(/datum/hive_status, free_respawn), xeno.client), 5 SECONDS)
+
+	xeno.gib(create_cause_data("sacrificing itself", src))
+
+/datum/action/xeno_action/activable/healer_sacrifice/action_activate()
+	..()
+	var/mob/living/carbon/xenomorph/xeno = owner
+	if(xeno.selected_ability != src)
+		return
+	var/datum/behavior_delegate/drone_healer/behavior_delegate = xeno.behavior_delegate
+	if(!istype(behavior_delegate))
+		return
+	if(behavior_delegate.transferred_amount < behavior_delegate.required_transferred_amount)
+		to_chat(xeno, SPAN_HIGHDANGER("Warning: [name] is a last measure skill. Using it will kill us."))
+	else
+		to_chat(xeno, SPAN_HIGHDANGER("Warning: [name] is a last measure skill. Using it will kill us, but new life will be granted for our hard work for the hive."))
+