Porting movespeed modification system updates.

code/modules/antagonists/changeling/powers/strained_muscles.dm

@@ -21,7 +21,7 @@
 		to_chat(user, "<span class='notice'>Our muscles tense and strengthen.</span>")
 		changeling.chem_recharge_slowdown += 0.5
 	else
-		REMOVE_TRAIT(user, TRAIT_GOTTAGOFAST, "changeling_muscles")
+		user.remove_movespeed_modifier(MOVESPEED_ID_CHANGELING_MUSCLES)
 		to_chat(user, "<span class='notice'>Our muscles relax.</span>")
 		changeling.chem_recharge_slowdown -= 0.5
 		if(stacks >= 20)
@@ -36,12 +36,12 @@
 /obj/effect/proc_holder/changeling/strained_muscles/proc/muscle_loop(mob/living/carbon/user)
 	var/datum/antagonist/changeling/changeling = user.mind.has_antag_datum(/datum/antagonist/changeling)
 	while(active)
-		ADD_TRAIT(user, TRAIT_GOTTAGOFAST, "changeling_muscles")
+		user.add_movespeed_modifier(MOVESPEED_ID_CHANGELING_MUSCLES, update=TRUE, priority=100, multiplicative_slowdown=-1, blacklisted_movetypes=(FLYING|FLOATING))
 		if(user.stat != CONSCIOUS || user.staminaloss >= 90)
 			active = !active
 			to_chat(user, "<span class='notice'>Our muscles relax without the energy to strengthen them.</span>")
 			user.Knockdown(40)
-			REMOVE_TRAIT(user, TRAIT_GOTTAGOFAST, "changeling_muscles")
+			user.remove_movespeed_modifier(MOVESPEED_ID_CHANGELING_MUSCLES)
 			changeling.chem_recharge_slowdown -= 0.5
 			break
 

code/modules/antagonists/revenant/revenant_blight.dm

@@ -45,11 +45,11 @@
 		if(3)
 			if(!depression)
 				depression = SEND_SIGNAL(affected_mob, COMSIG_ADD_MOOD_EVENT, "rev_blight", /datum/mood_event/revenant_blight)
-			SEND_SIGNAL(affected_mob, COMSIG_DECREASE_SANITY, 0.12, SANITY_CRAZY)
+			SEND_SIGNAL(affected_mob, COMSIG_MODIFY_SANITY, -0.12, SANITY_CRAZY)
 			if(prob(10))
 				affected_mob.emote(pick("pale","shiver"))
 		if(4)
-			SEND_SIGNAL(affected_mob, COMSIG_DECREASE_SANITY, 0.18, SANITY_CRAZY)
+			SEND_SIGNAL(affected_mob, COMSIG_MODIFY_SANITY, -0.18, SANITY_CRAZY)
 			if(prob(15))
 				affected_mob.emote(pick("pale","shiver","cries"))
 		if(5)

code/modules/antagonists/slaughter/slaughter.dm

@@ -34,7 +34,6 @@
 	melee_damage_upper = 30
 	see_in_dark = 8
 	lighting_alpha = LIGHTING_PLANE_ALPHA_MOSTLY_INVISIBLE
-	var/boost = 0
 	bloodcrawl = BLOODCRAWL_EAT
 	var/playstyle_string = "<span class='big bold'>You are a slaughter demon,</span><B> a terrible creature from another realm. You have a single desire: To kill.  \
 							You may use the \"Blood Crawl\" ability near blood pools to travel through them, appearing and disappearing from the station at will. \
@@ -54,24 +53,18 @@
 	if(istype(loc, /obj/effect/dummy/phased_mob/slaughter))
 		bloodspell.phased = TRUE
 
-/mob/living/simple_animal/slaughter/Life()
-	..()
-	if(boost<world.time)
-		speed = 1
-	else
-		speed = 0
-
 /obj/effect/decal/cleanable/blood/innards
 	icon = 'icons/obj/surgery.dmi'
 	name = "pile of viscera"
 	desc = "A repulsive pile of guts and gore."
 	gender = NEUTER
 	icon_state = "innards"
+	random_icon_states = null
 
 /mob/living/simple_animal/slaughter/phasein()
 	. = ..()
-	speed = 0
-	boost = world.time + 60
+	add_movespeed_modifier(MOVESPEED_ID_SLAUGHTER, update=TRUE, priority=100, multiplicative_slowdown=-1)
+	addtimer(CALLBACK(src, .proc/remove_movespeed_modifier, MOVESPEED_ID_SLAUGHTER, TRUE), 6 SECONDS, TIMER_UNIQUE | TIMER_OVERRIDE)
 
 
 //The loot from killing a slaughter demon - can be consumed to allow the user to blood crawl