Reworks the morph. Makes it a more stealth ambush oriented antag

code/datums/spell.dm

@@ -216,7 +216,7 @@ GLOBAL_LIST_INIT(spells, typesof(/obj/effect/proc_holder/spell))
 	charge_counter = charge_max
 
 /obj/effect/proc_holder/spell/proc/perform(list/targets, recharge = 1, mob/user = usr, make_attack_logs = TRUE) //if recharge is started is important for the trigger spells
-	before_cast(targets)
+	before_cast(targets, user)
 	invocation()
 	if(user && user.ckey && make_attack_logs)
 		add_attack_logs(user, targets, "cast the spell [name]", ATKLOG_ALL)
@@ -235,7 +235,7 @@ GLOBAL_LIST_INIT(spells, typesof(/obj/effect/proc_holder/spell))
 	if(action)
 		action.UpdateButtonIcon()
 
-/obj/effect/proc_holder/spell/proc/before_cast(list/targets)
+/obj/effect/proc_holder/spell/proc/before_cast(list/targets, mob/user)
 	if(overlay)
 		for(var/atom/target in targets)
 			var/location

code/datums/spells/area_teleport.dm

@@ -21,7 +21,7 @@
 	cast(targets,thearea)
 	after_cast(targets)
 
-/obj/effect/proc_holder/spell/targeted/area_teleport/before_cast(list/targets)
+/obj/effect/proc_holder/spell/targeted/area_teleport/before_cast(list/targets, mob/user)
 	var/A = null
 
 	if(!randomise_selection)
@@ -35,7 +35,7 @@
 	var/area/thearea = GLOB.teleportlocs[A]
 
 	if(thearea.tele_proof && !istype(thearea, /area/wizard_station))
-		to_chat(usr, "A mysterious force disrupts your arcane spell matrix, and you remain where you are.")
+		to_chat(user, "A mysterious force disrupts your arcane spell matrix, and you remain where you are.")
 		return
 
 	return thearea

code/datums/spells/mimic.dm

@@ -0,0 +1,205 @@
+/obj/effect/proc_holder/spell/targeted/click/mimic
+	name = "Mimic"
+	desc =  "Learn a new form to mimic or become one of your known forms"
+	clothes_req = FALSE
+	charge_max = 3 SECONDS
+	include_user = TRUE // To change forms
+	action_icon_state = "genetic_morph"
+	allowed_type = /atom/movable
+	auto_target_single = FALSE
+	click_radius = -1
+	selection_activated_message = "<span class='sinister'>Click on a target to remember it's form. Click on yourself to change form.</span>"
+	create_logs = FALSE
+	action_icon_state = "morph_mimic"
+	/// Which form is currently selected
+	var/datum/mimic_form/selected_form
+	/// Which forms the user can become
+	var/list/available_forms = list()
+	/// How many forms the user can remember
+	var/max_forms = 5
+	/// Which index will be overriden next when the user wants to remember another form
+	var/next_override_index = 1
+	/// If a message is shown when somebody examines the user from close range
+	var/perfect_disguise = FALSE
+
+	var/static/list/black_listed_form_types = list(/obj/screen, /obj/singularity, /obj/effect, /mob/living/simple_animal/hostile/megafauna, /atom/movable/lighting_object, /obj/machinery/dna_vault,
+													/obj/machinery/power/bluespace_tap)
+
+/obj/effect/proc_holder/spell/targeted/click/mimic/valid_target(atom/target, user)
+	if(is_type_in_list(target, black_listed_form_types))
+		return FALSE
+	if(istype(target, /atom/movable))
+		var/atom/movable/M = target
+		if(M.bound_height > world.icon_size || M.bound_width > world.icon_size)
+			return FALSE // No multitile structures
+	if(user != target && istype(target, /mob/living/simple_animal/hostile/morph))
+		return FALSE
+	return ..()
+
+/obj/effect/proc_holder/spell/targeted/click/mimic/cast(list/targets, mob/user)
+	var/atom/movable/A = targets[1]
+	if(A == user)
+		INVOKE_ASYNC(src, .proc/pick_form, user)
+		return
+
+	INVOKE_ASYNC(src, .proc/remember_form, A, user)
+
+/obj/effect/proc_holder/spell/targeted/click/mimic/proc/remember_form(atom/movable/A, mob/user)
+	if(A.name in available_forms)
+		to_chat(user, "<span class='warning'>[A] is already an available form.</span>")
+		revert_cast(user)
+		return
+	if(length(available_forms) >= max_forms)
+		to_chat(user, "<span class='warning'>You start to forget the form of [available_forms[next_override_index]] to learn a new one.</span>")
+
+	to_chat(user, "<span class='sinister'>You start remembering the form of [A].</span>")
+	if(!do_after(user, 2 SECONDS, FALSE, user))
+		to_chat(user, "<span class='warning'>You lose focus.</span>")
+		return
+
+	// Forget the old form if needed
+	if(length(available_forms) >= max_forms)
+		qdel(available_forms[available_forms[next_override_index]]) // Delete the value using the key
+		available_forms[next_override_index++] = A.name
+		// Reset if needed
+		if(next_override_index > max_forms)
+			next_override_index = 1
+
+	available_forms[A.name] = new /datum/mimic_form(A, user)
+	to_chat(user, "<span class='sinister'>You learn the form of [A].</span>")
+
+/obj/effect/proc_holder/spell/targeted/click/mimic/proc/pick_form(mob/user)
+	if(!length(available_forms))
+		to_chat(user, "<span class='warning'>No available forms. Learn more forms by using this spell on other objects first.</span>")
+		revert_cast(user)
+		return
+
+	var/list/forms = list()
+	if(selected_form)
+		forms += "Original Form"
+
+	forms += available_forms.Copy()
+	var/what = input(user, "Which form do you want to become?", "Mimic") as null|anything in forms
+	if(!what)
+		to_chat(user, "<span class='notice'>You decide against changing forms.</span>")
+		revert_cast(user)
+		return
+
+	if(what == "Original Form")
+		restore_form(user)
+		return
+	to_chat(user, "<span class='sinister'>You start becoming [what].</span>")
+	if(!do_after(user, 2 SECONDS, FALSE, user))
+		to_chat(user, "<span class='warning'>You lose focus.</span>")
+		return
+	take_form(available_forms[what], user)
+
+/obj/effect/proc_holder/spell/targeted/click/mimic/proc/take_form(datum/mimic_form/form, mob/user)
+
+	var/old_name = "[user]"
+	if(ishuman(user))
+		// Not fully finished yet
+		var/mob/living/carbon/human/H = user
+		H.name_override = form.name
+
+	else
+		user.appearance = form.appearance
+		user.transform = initial(user.transform)
+		user.pixel_y = initial(user.pixel_y)
+		user.pixel_x = initial(user.pixel_x)
+		user.layer = MOB_LAYER // Avoids weirdness when mimicing something below the vent layer
+
+	playsound(user, "bonebreak", 75, TRUE)
+	show_change_form_message(user, old_name, "[user]")
+	user.create_log(MISC_LOG, "Mimicked into [user]")
+
+	if(!selected_form)
+		RegisterSignal(user, COMSIG_PARENT_EXAMINE, .proc/examine_override)
+		RegisterSignal(user, COMSIG_MOB_DEATH, .proc/on_death)
+
+	selected_form = form
+
+/obj/effect/proc_holder/spell/targeted/click/mimic/proc/show_change_form_message(mob/user, old_name, new_name)
+	user.visible_message("<span class='warning'>[old_name] contorts and slowly becomes [new_name]!</span>", "<span class='sinister'>You take form of [new_name].</span>", "You hear loud cracking noises!")
+
+/obj/effect/proc_holder/spell/targeted/click/mimic/proc/restore_form(mob/user, show_message = TRUE)
+	selected_form = null
+	var/old_name = "[user]"
+
+	user.cut_overlays()
+	user.icon = initial(user.icon)
+	user.icon_state = initial(user.icon_state)
+	if(ishuman(user))
+		var/mob/living/carbon/human/H = user
+		H.name_override = null
+		H.regenerate_icons()
+
+	else
+		user.name = initial(user.name)
+		user.desc = initial(user.desc)
+
+	playsound(user, "bonebreak", 150, TRUE)
+	if(show_message)
+		show_restore_form_message(user, old_name, "[user]")
+
+	UnregisterSignal(user, list(COMSIG_PARENT_EXAMINE, COMSIG_MOB_DEATH))
+
+/obj/effect/proc_holder/spell/targeted/click/mimic/proc/show_restore_form_message(mob/user, old_name, new_name)
+	user.visible_message("<span class='warning'>[old_name] shakes and contorts and quickly becomes [new_name]!</span>", "<span class='sinister'>You take return to your normal self.</span>", "You hear loud cracking noises!")
+
+/obj/effect/proc_holder/spell/targeted/click/mimic/proc/examine_override(datum/source, mob/user, list/examine_list)
+	examine_list.Cut()
+	examine_list += selected_form.examine_text
+	if(!perfect_disguise && get_dist(user, source) <= 3)
+		examine_list += "<span class='warning'>It doesn't look quite right...</span>"
+
+/obj/effect/proc_holder/spell/targeted/click/mimic/proc/on_death(mob/user, gibbed)
+	if(!gibbed)
+		restore_form(user, FALSE)
+		show_death_message(user)
+
+/obj/effect/proc_holder/spell/targeted/click/mimic/proc/show_death_message(mob/user)
+	user.visible_message("<span class='warning'>[user] shakes and contorts as he dies. Returning to his true form!</span>", "<span class='deadsay'>Your disguise fails as your life forces drain away.</span>", "You hear loud cracking noises followed by a thud!")
+
+
+/datum/mimic_form
+	/// How does the form look like?
+	var/appearance
+	/// What is the examine text paired with this form
+	var/examine_text
+	/// What the name of the form is
+	var/name
+
+/datum/mimic_form/New(atom/movable/form, mob/user)
+	appearance = form.appearance
+	examine_text = form.examine(user)
+	name = form.name
+
+
+/obj/effect/proc_holder/spell/targeted/click/mimic/morph
+	action_background_icon_state = "bg_morph"
+
+/obj/effect/proc_holder/spell/targeted/click/mimic/morph/valid_target(atom/target, user)
+	if(target != user && istype(target, /mob/living/simple_animal/hostile/morph))
+		return FALSE
+	return ..()
+
+/obj/effect/proc_holder/spell/targeted/click/mimic/morph/take_form(datum/mimic_form/form, mob/living/simple_animal/hostile/morph/user)
+	..()
+	user.assume()
+
+/obj/effect/proc_holder/spell/targeted/click/mimic/morph/restore_form(mob/living/simple_animal/hostile/morph/user, show_message = TRUE)
+	..()
+	user.restore()
+
+/obj/effect/proc_holder/spell/targeted/click/mimic/morph/show_change_form_message(mob/user, old_name, new_name)
+	user.visible_message("<span class='warning'>[old_name] suddenly twists and changes shape, becoming a copy of [new_name]!</span>", \
+					"<span class='notice'>You twist your body and assume the form of [new_name].</span>")
+
+/obj/effect/proc_holder/spell/targeted/click/mimic/morph/show_restore_form_message(mob/user, old_name, new_name)
+	user.visible_message("<span class='warning'>[old_name] suddenly collapses in on itself, dissolving into a pile of green flesh!</span>", \
+					"<span class='notice'>You reform to your normal body.</span>")
+
+/obj/effect/proc_holder/spell/targeted/click/mimic/morph/show_death_message(mob/user)
+	user.visible_message("<span class='warning'>[user] twists and dissolves into a pile of green flesh!</span>", \
+						"<span class='userdanger'>Your skin ruptures! Your flesh breaks apart! No disguise can ward off de--</span>")