A bit more work

code/modules/mob/living/simple_animal/revenant/revenant.dm

@@ -8,7 +8,7 @@
 	desc = "A malevolent spirit."
 	icon = 'icons/mob/mob.dmi'
 	icon_state = "revenant_idle"
-	incorporeal_move = 1
+	incorporeal_move = 3
 	invisibility = INVISIBILITY_OBSERVER
 	health = 25
 	maxHealth = 25
@@ -35,6 +35,17 @@
 	var/revealed = 0 //If the revenant can take damage from normal sources.
 	var/inhibited = 0 //If the revenant's abilities are blocked by a chaplain's power.
 
+/mob/living/simple_animal/revenant/relaymove(var/mob/user, direction)
+	var/turf/newLoc = get_step(src,direction)
+	world << "memes"
+	if((newLoc.flags & NOJAUNT))
+		world << "they're dank"
+		user << "<span class='warning'>A holy aura pervades this area.</span>"
+		notransform = 0
+		spawn(2)
+			notransform = 1
+			return 0
+
 /mob/living/simple_animal/revenant/Life()
 	..()
 	if(essence < essence_min)
@@ -50,9 +61,6 @@
 	if(essence_regen && !inhibited && essence < essence_regen_cap) //While inhibited, essence will not regenerate
 		essence++
 
-/mob/living/simple_animal/revenant/Process_Spacemove(var/movement_dir = 0)
-	return 1 //Mainly to prevent the no-grav effect
-
 /mob/living/simple_animal/revenant/ex_act(severity, target)
 	return 1 //Immune to the effects of explosions.
 
@@ -91,16 +99,26 @@
 	..()
 	spawn(5)
 		if(src.mind)
+			src.mind.remove_all_antag()
+			src.mind.wipe_memory()
 			src << 'sound/effects/ghost.ogg'
-			src.store_memory("<span class='deadsay'>I am a revenant. My spectral form has been empowered. My only goal is to gather essence from the humans of [world.name].</span>")
 			src << "<br>"
 			src << "<span class='deadsay'><font size=3><b>You are a revenant.</b></font></span>"
 			src << "<b>Your formerly mundane spirit has been infused with alien energies and empowered into a revenant.</b>"
 			src << "<b>You are not dead, not alive, but somewhere in between. You are capable of limited interaction with both worlds.</b>"
 			src << "<b>You are invincible and invisible to everyone but other ghosts. Some abilities may change this.</b>"
-			src << "<b>You are an animancer - to function, you are to drain the life essence from humans. This essence is a resource and will power all of your abilities.</b>"
+			src << "<b>To function, you are to drain the life essence from humans. This essence is a resource and will power all of your abilities.</b>"
+			src << "<b><i>You do not remember anything of your past lives, nor will you remember anything about this one after your death.</i></b>"
 			src << "<b>Be sure to read the wiki page at https://tgstation13.org/wiki/Revenant to learn more.</b>"
-			src << "<br>"
+			var/datum/objective/revenant/objective = new
+			objective.owner = src
+			src.mind.objectives += objective
+			src << "<b>Objective #1</b>: [objective.explanation_text]"
+			var/datum/objective/revenantFluff/objective2 = new
+			objective2.owner = src
+			src.mind.objectives += objective2
+			src << "<b>Objective #2</b>: [objective2.explanation_text]"
+			ticker.mode.traitors |= src.mind //Necessary for announcing
 		if(!src.giveSpells())
 			message_admins("Revenant was created but has no mind. Trying again in five seconds.")
 			spawn(50)
@@ -113,11 +131,12 @@
 		src.mind.spell_list += new /obj/effect/proc_holder/spell/targeted/revenant_harvest
 		src.mind.spell_list += new /obj/effect/proc_holder/spell/targeted/revenant_transmit
 		src.mind.spell_list += new /obj/effect/proc_holder/spell/aoe_turf/revenant_light
+		src.mind.spell_list += new /obj/effect/proc_holder/spell/aoe_turf/revenantDefile
 		return 1
 	return 0
 
 /mob/living/simple_animal/revenant/death()
-	if(!strikes)
+	if(strikes)
 		return 0 //Impossible to die with strikes still active
 	..(1)
 	src << "<span class='userdanger'><b>NO! No... it's too late, you can feel yourself fading...</b></span>"
@@ -127,7 +146,7 @@
 	playsound(src, 'sound/effects/screech.ogg', 100, 1)
 	visible_message("<span class='warning'>[src] lets out a waning screech as violet mist swirls around its dissolving body!</span>")
 	icon_state = "revenant_draining"
-	for(var/i = alpha, i > 0, i--)
+	for(var/i = alpha, i > 0, i -= 10)
 		sleep(0.1)
 		alpha = i
 	visible_message("<span class='danger'>[src]'s body breaks apart into blue dust.</span>")
@@ -148,34 +167,30 @@
 /mob/living/simple_animal/revenant/attackby(obj/item/W, mob/living/user, params)
 	..()
 	if(istype(W, /obj/item/weapon/nullrod))
-		src.visible_message("<b>The revenant</b> screeches and flails!", \
-							"<span class='boldannounce'>The null rod invokes agony in you! You feel your essence draining away!</span>")
-		src.essence -= 25 //hella effective
-		src.inhibited = 1
+		visible_message("<span class='warning'>[src] violently flinches!</span>", \
+						"<span class='boldannounce'>The null rod invokes agony in you! You feel your essence draining away!</span>")
+		essence -= 25 //hella effective
+		inhibited = 1
 		spawn(30)
-			src.inhibited = 0
+			inhibited = 0
 
 
 
-/obj/effect/proc_holder/spell/proc/essence_check(var/essence_cost, var/silent = 0)
-	var/mob/living/simple_animal/revenant/W = usr
-	if(!istype(usr) || !usr)
+/mob/living/simple_animal/revenant/proc/castcheck(var/essence_cost)
+	var/mob/living/simple_animal/revenant/user = usr
+	if(!istype(user) || !user)
 		return
-	if(W.essence < essence_cost)
-		if(!silent)
-			W << "<span class='warning'>You need [essence_cost]E to use [name] but you only have [W.essence]E available. Harvest some more things.</span>"
-		return 0
-	W.essence -= essence_cost
-	return 1
-
-
-
-/mob/living/simple_animal/revenant/proc/wallcheck()
 	var/turf/T = get_turf(usr)
-	if(!istype(T, /turf/simulated/wall))
-		return 1
-	usr << "<span class='warning'>[T] is solid and is blocking your abilities' effects.</span>"
-	return 0
+	if(istype(T, /turf/simulated/wall))
+		user << "<span class='warning'>You cannot use abilities from inside of a wall.</span>"
+		return 0
+	if(!user.change_essence_amount(essence_cost, 1))
+		user << "<span class='warning'>You lack the essence to use that ability.</span>"
+		return 0
+	if(user.inhibited)
+		user << "<span class='warning'>Your powers have been suppressed by holy energies!</span>"
+		return 0
+	return 1
 
 
 
@@ -183,14 +198,15 @@
 	var/mob/living/simple_animal/revenant/user = usr
 	if(!istype(usr) || !usr)
 		return
-	if(!essence_amt)
+	if(user.essence + essence_amt <= 0)
 		return
 	user.essence += essence_amt
+	user.essence = Clamp(user.essence, 0, INFINITY)
 	if(!silent)
-		if(essence_amt >= 0)
-			user << "<span class='info'>Gained [essence_amt]E from [source].</span>"
+		if(essence_amt > 0)
+			user << "<span class='notice'>Gained [essence_amt]E from [source].</span>"
 		else
-			user << "<span class='info'>Lost [essence_amt]E from [source].</span>"
+			user << "<span class='danger'>Lost [essence_amt]E from [source].</span>"
 	return 1
 
 
@@ -208,3 +224,39 @@
 		R.invisibility = INVISIBILITY_OBSERVER
 		if(stun)
 			R.notransform = 0
+
+/datum/objective/revenant
+	dangerrating = 10
+	var/targetAmount = 100
+
+/datum/objective/revenant/New()
+	targetAmount = rand(100,200)
+	explanation_text = "Absorb [targetAmount] points of essence."
+	..()
+
+/datum/objective/revenant/check_completion()
+	if(!istype(owner.current, /mob/living/simple_animal/revenant) || !owner.current)
+		return 0
+	var/mob/living/simple_animal/revenant/R = owner.current
+	if(!R || R.stat == DEAD)
+		return 0
+	var/essenceAccumulated = R.essence
+	if(essenceAccumulated < targetAmount)
+		return 0
+	return 1
+
+/datum/objective/revenantFluff
+	dangerrating = 0
+
+/datum/objective/revenantFluff/New()
+	var/list/explanationTexts = list("Attempt to make your presence unknown to the crew.", \
+									 "Collaborate with existing antagonists aboard the station to gain essence.", \
+									 "Remain nonlethal and only absorb bodies that have already died.", \
+									 "Use your environments to eliminate isolated people.", \
+									 "If there is a chaplain aboard the station, ensure they are killed.", \
+									 "Hinder the crew without killing them.")
+	explanation_text = pick(explanationTexts)
+	..()
+
+/datum/objective/revenantFluff/check_completion()
+	return 1

code/modules/mob/living/simple_animal/revenant/revenant_abilities.dm

@@ -11,11 +11,7 @@
 	var/list/drained_mobs = list() //Cannot harvest the same mob twice
 
 /obj/effect/proc_holder/spell/targeted/revenant_harvest/cast(list/targets, var/mob/living/simple_animal/revenant/user = usr)
-	if(user.inhibited)
-		user << "<span class='warning'>Something is blocking the use of [src]!</span>"
-		charge_counter = charge_max
-		return
-	if(!user.wallcheck())
+	if(!user.castcheck(0))
 		charge_counter = charge_max
 		return
 	for(var/mob/living/carbon/human/target in targets)
@@ -87,11 +83,10 @@
 	var/locked = 1
 
 /obj/effect/proc_holder/spell/targeted/revenant_transmit/cast(list/targets, var/mob/living/simple_animal/revenant/user = usr)
-	if(user.inhibited)
-		user << "<span class='warning'>Something is blocking the use of [src]!</span>"
+	if(!user.castcheck(-5))
 		charge_counter = charge_max
 		return
-	if(locked && essence_check(5, 1))
+	if(locked)
 		usr << "<span class='info'>You have unlocked Transmit!</span>"
 		locked = 0
 		charge_counter = charge_max
@@ -99,15 +94,6 @@
 		range = 7
 		include_user = 0
 		return
-	if(locked)
-		charge_counter = charge_max
-		return
-	if(!user.wallcheck())
-		charge_counter = charge_max
-		return
-	if(!essence_check(5))
-		charge_counter = charge_max
-		return
 	for(var/mob/living/M in targets)
 		spawn(0)
 			var/msg = stripped_input(usr, "What do you wish to tell [M]?", null, "")
@@ -129,25 +115,14 @@
 	var/locked = 1
 
 /obj/effect/proc_holder/spell/aoe_turf/revenant_light/cast(list/targets, var/mob/living/simple_animal/revenant/user = usr)
-	if(user.inhibited)
-		user << "<span class='warning'>Something is blocking the use of [src]!</span>"
-		charge_counter = charge_max
-		return
-	if(locked && essence_check(25, 1))
-		user << "<span class='info'>You have unlocked Overload Light!</span>"
-		name = "Overload Light (25E)"
-		panel = "Revenant Abilities"
-		locked = 0
-		range = 5
+	if(!user.castcheck(-25))
 		charge_counter = charge_max
 		return
 	if(locked)
-		charge_counter = charge_max
-		return
-	if(!user.wallcheck())
-		charge_counter = charge_max
-		return
-	if(!essence_check(25))
+		user << "<span class='info'>You have unlocked Overload Light!</span>"
+		panel = "Revenant Abilities"
+		locked = 0
+		range = 5
 		charge_counter = charge_max
 		return
 	for(var/turf/T in targets)
@@ -165,3 +140,44 @@
 						M.electrocute_act(25, "[L.name]")
 						playsound(M, 'sound/machines/defib_zap.ogg', 50, 1, -1)
 	user.reveal(50, 1)
+
+
+//Defile: Corrupts nearby stuff, unblesses floor tiles.
+/obj/effect/proc_holder/spell/aoe_turf/revenantDefile
+	name = "Defile (30E)"
+	desc = "Twists and corrupts certain nearby objects."
+	panel = "Revenant Abilities (Locked)"
+	charge_max = 300
+	clothes_req = 0
+	range = 1
+	var/locked = 1
+
+/obj/effect/proc_holder/spell/aoe_turf/revenantDefile/cast(list/targets, var/mob/living/simple_animal/revenant/user = usr)
+	if(!user.castcheck(-30))
+		charge_counter = charge_max
+		return
+	if(locked)
+		user << "<span class='info'>You have unlocked Defile!</span>"
+		panel = "Revenant Abilities"
+		locked = 0
+		range = 4
+		charge_counter = charge_max
+		return
+	for(var/turf/T in targets)
+		spawn(0)
+			if(T.flags & NOJAUNT)
+				T.flags -= NOJAUNT
+			for(var/obj/machinery/bot/bot in T.contents)
+				bot.emag_act()
+				bot.visible_message("<span class='warning'>[bot] [pick("shudders", "buzzes", "clunks")] [pick("oddly", "strangely", "loudly")]!</span>")
+			for(var/mob/living/carbon/human/human in T.contents)
+				human << "<span class='warning'>You suddenly feel tired.</span>"
+				human.adjustStaminaLoss(25)
+			for(var/mob/living/silicon/robot/robot in T.contents)
+				robot.visible_message("<span class='warning'>[robot] lets out an alarm!</span>", \
+									  "<span class='boldannounce'>01001111 01010110 01000101 01010010 01001100 01001111 01000001 01000100</span>")
+				robot << 'sound/misc/interference.ogg'
+				playsound(robot, 'sound/machines/warning-buzzer.ogg', 50, 1)
+			for(var/obj/structure/window/window in T.contents)
+				window.hit(rand(10,50))
+	user.reveal(30, 1)

code/modules/mob/living/simple_animal/revenant/revenant_spawn_event.dm

@@ -1,3 +1,5 @@
+#define REVENANT_SPAWN_THRESHOLD 20
+
 /datum/round_event_control/revenant
 	name = "Spawn Revenant"
 	typepath = /datum/round_event/revenant
@@ -6,13 +8,17 @@
 	earliest_start = 0 //Meant to mix things up early-game.
 
 
-
 /datum/round_event/revenant
 	var/key_of_revenant
 
 
-
 /datum/round_event/revenant/proc/get_revenant(var/end_if_fail = 0)
+	var/deadMobs = 0
+	for(var/mob/M in dead_mob_list)
+		deadMobs++
+	if(deadMobs < REVENANT_SPAWN_THRESHOLD)
+		message_admins("Random event attempted to spawn a revenant, but there were only [deadMobs]/[REVENANT_SPAWN_THRESHOLD] dead mobs.")
+		return
 	key_of_revenant = null
 	if(!key_of_revenant)
 		var/list/candidates = get_candidates(BE_REVENANT)
@@ -41,23 +47,21 @@
 	player_mind.assigned_role = "revenant"
 	player_mind.special_role = "Revenant"
 	ticker.mode.traitors |= player_mind
-	message_admins("[key_of_revenant] has been made into a Revenant by an event.")
-	log_game("[key_of_revenant] was spawned as a Revenant by an event.")
+	message_admins("[key_of_revenant] has been made into a revenant by an event.")
+	log_game("[key_of_revenant] was spawned as a revenant by an event.")
 	return 1
 
 
-
 /datum/round_event/revenant/start()
 	get_revenant()
 
 
-
 /datum/round_event/revenant/proc/find_revenant()
-	message_admins("Attempted to spawn a Revenant but there was no players available. Will try again momentarily, bear with me...")
+	message_admins("An event failed to spawn a revenant. Retrying momentarily...")
 	spawn(50)
 		if(get_revenant(1))
-			message_admins("Hooray! Situation has been resolved, [key_of_revenant] has been spawned as a Revenant.")
-			log_game("[key_of_revenant] was spawned as a Revenant by an event.")
+			message_admins("[key_of_revenant] has been spawned as a revenant.")
+			log_game("[key_of_revenant] was spawned as a revenant by an event.")
 			return 0
-		message_admins("Unfortunately, no candidates were available for becoming a Revenant. Shutting down. :(")
+		message_admins("No candidates were available for becoming a revenant.")
 	return kill()

code/modules/mob/mob_movement.dm

@@ -297,6 +297,16 @@
 					anim(mobloc,mob,'icons/mob/mob.dmi',,"shadow",,L.dir)
 				L.loc = get_step(L, direct)
 			L.dir = direct
+		if(3) //Incorporeal move, but blocked by holy-watered tiles
+			var/turf/simulated/floor/stepTurf = get_step(L, direct)
+			if(stepTurf.flags & NODROP)
+				L << "<span class='warning'>Holy energies block your path.</span>"
+				L.notransform = 1
+				spawn(2)
+					L.notransform = 0
+			else
+				L.loc = get_step(L, direct)
+				L.dir = direct
 	return 1