diff --git a/code/datums/spells/wizard.dm b/code/datums/spells/wizard.dm
index 1adcfc279e0..03aa46653a9 100644
--- a/code/datums/spells/wizard.dm
+++ b/code/datums/spells/wizard.dm
@@ -147,6 +147,20 @@
 
 	action_icon_state = "spell_forcewall"
 
+/obj/effect/proc_holder/spell/aoe_turf/conjure/timestop
+	name = "Stop Time"
+	desc = "This spell stops time for everyone except for you, allowing you to move freely while your enemies and even projectiles are frozen."
+	charge_max = 500
+	clothes_req = 1
+	invocation = "TOKI WO TOMARE"
+	invocation_type = "shout"
+	range = 0
+	cooldown_min = 100
+	summon_amt = 1
+	action_icon_state = "time"
+
+	summon_type = list(/obj/effect/timestop/wizard)
+
 /obj/effect/proc_holder/spell/aoe_turf/conjure/carp
 	name = "Summon Carp"
 	desc = "This spell conjures a simple carp."
diff --git a/code/game/gamemodes/wizard/spellbook.dm b/code/game/gamemodes/wizard/spellbook.dm
index e54e2567ce4..c8d64fb1b27 100644
--- a/code/game/gamemodes/wizard/spellbook.dm
+++ b/code/game/gamemodes/wizard/spellbook.dm
@@ -126,6 +126,12 @@
 	spell_type = /obj/effect/proc_holder/spell/aoe_turf/repulse
 	log_name = "RP"
 
+/datum/spellbook_entry/timestop
+	name = "Time Stop"
+	spell_type = /obj/effect/proc_holder/spell/aoe_turf/conjure/timestop
+	log_name = "TS"
+	category = "Defensive"
+
 /datum/spellbook_entry/smoke
 	name = "Smoke"
 	spell_type = /obj/effect/proc_holder/spell/targeted/smoke
diff --git a/code/modules/projectiles/projectile.dm b/code/modules/projectiles/projectile.dm
index 647d8d14a2c..3716cb32d81 100644
--- a/code/modules/projectiles/projectile.dm
+++ b/code/modules/projectiles/projectile.dm
@@ -31,6 +31,7 @@
 	var/atom/original = null // the original target clicked
 	var/turf/starting = null // the projectile's starting turf
 	var/list/permutated = list() // we've passed through these atoms, don't try to hit them again
+	var/paused = FALSE //for suspending the projectile midair
 
 	var/p_x = 16
 	var/p_y = 16 // the pixel location of the tile that the player clicked. Default is the center
@@ -202,73 +203,74 @@
 					if(kill_count < 1)
 						del(src)
 						return
-					kill_count--
-					if((!( current ) || loc == current))
-						current = locate(Clamp(x+xo,1,world.maxx),Clamp(y+yo,1,world.maxy),z)
+					if(!paused)
+						kill_count--
+						if((!( current ) || loc == current))
+							current = locate(Clamp(x+xo,1,world.maxx),Clamp(y+yo,1,world.maxy),z)
 
-					if(!Angle)
-						Angle=round(Get_Angle(src,current))
-					//world << "[Angle] angle"
-					//overlays.Cut()
-					//var/icon/I=new(initial(icon),icon_state) //using initial(icon) makes sure that the angle for that is reset as well
-					//I.Turn(Angle)
-					//I.DrawBox(rgb(255,0,0,50),1,1,32,32)
-					//icon = I
-					if(spread) //Chaotic spread
-						Angle += (rand() - 0.5) * spread
-					var/matrix/M = new//matrix(transform)
-					M.Turn(Angle)
-					transform = M
+						if(!Angle)
+							Angle=round(Get_Angle(src,current))
+						//world << "[Angle] angle"
+						//overlays.Cut()
+						//var/icon/I=new(initial(icon),icon_state) //using initial(icon) makes sure that the angle for that is reset as well
+						//I.Turn(Angle)
+						//I.DrawBox(rgb(255,0,0,50),1,1,32,32)
+						//icon = I
+						if(spread) //Chaotic spread
+							Angle += (rand() - 0.5) * spread
+						var/matrix/M = new//matrix(transform)
+						M.Turn(Angle)
+						transform = M
 
-					var/Pixel_x=round(sin(Angle)+16*sin(Angle)*2)
-					var/Pixel_y=round(cos(Angle)+16*cos(Angle)*2)
-					var/pixel_x_offset = pixel_x + Pixel_x
-					var/pixel_y_offset = pixel_y + Pixel_y
-					var/new_x = x
-					var/new_y = y
-					//Not sure if using whiles for this is good
-					while(pixel_x_offset > 16)
-						//world << "Pre-adjust coords (x++): xy [pixel_x] xy offset [pixel_x_offset]"
-						pixel_x_offset -= 32
-						pixel_x -= 32
-						new_x++// x++
-					while(pixel_x_offset < -16)
-						//world << "Pre-adjust coords (x--): xy [pixel_x] xy offset [pixel_x_offset]"
-						pixel_x_offset += 32
-						pixel_x += 32
-						new_x--
+						var/Pixel_x=round(sin(Angle)+16*sin(Angle)*2)
+						var/Pixel_y=round(cos(Angle)+16*cos(Angle)*2)
+						var/pixel_x_offset = pixel_x + Pixel_x
+						var/pixel_y_offset = pixel_y + Pixel_y
+						var/new_x = x
+						var/new_y = y
+						//Not sure if using whiles for this is good
+						while(pixel_x_offset > 16)
+							//world << "Pre-adjust coords (x++): xy [pixel_x] xy offset [pixel_x_offset]"
+							pixel_x_offset -= 32
+							pixel_x -= 32
+							new_x++// x++
+						while(pixel_x_offset < -16)
+							//world << "Pre-adjust coords (x--): xy [pixel_x] xy offset [pixel_x_offset]"
+							pixel_x_offset += 32
+							pixel_x += 32
+							new_x--
 
-					while(pixel_y_offset > 16)
-						//world << "Pre-adjust coords (y++): py [pixel_y] py offset [pixel_y_offset]"
-						pixel_y_offset -= 32
-						pixel_y -= 32
-						new_y++
-					while(pixel_y_offset < -16)
-						//world << "Pre-adjust coords (y--): py [pixel_y] py offset [pixel_y_offset]"
-						pixel_y_offset += 32
-						pixel_y += 32
-						new_y--
+						while(pixel_y_offset > 16)
+							//world << "Pre-adjust coords (y++): py [pixel_y] py offset [pixel_y_offset]"
+							pixel_y_offset -= 32
+							pixel_y -= 32
+							new_y++
+						while(pixel_y_offset < -16)
+							//world << "Pre-adjust coords (y--): py [pixel_y] py offset [pixel_y_offset]"
+							pixel_y_offset += 32
+							pixel_y += 32
+							new_y--
 
-					speed = round(speed) //Just in case.
-					step_towards(src, locate(new_x, new_y, z)) //Original projectiles stepped towards 'current'
-					if(speed <= 1) //We should really only animate at speed 2
-						pixel_x = pixel_x_offset
-						pixel_y = pixel_y_offset
-					else
-						animate(src, pixel_x = pixel_x_offset, pixel_y = pixel_y_offset, time = max(1, (speed <= 3 ? speed - 1 : speed)))
+						speed = round(speed) //Just in case.
+						step_towards(src, locate(new_x, new_y, z)) //Original projectiles stepped towards 'current'
+						if(speed <= 1) //We should really only animate at speed 2
+							pixel_x = pixel_x_offset
+							pixel_y = pixel_y_offset
+						else
+							animate(src, pixel_x = pixel_x_offset, pixel_y = pixel_y_offset, time = max(1, (speed <= 3 ? speed - 1 : speed)))
 
-/*
-					var/turf/T = get_turf(src)
-					if(T)
-						T.color = "#6666FF"
-						spawn(10)
-							T.color = initial(T.color)
-*/
+	/*
+						var/turf/T = get_turf(src)
+						if(T)
+							T.color = "#6666FF"
+							spawn(10)
+								T.color = initial(T.color)
+	*/
 
-					if(!bumped && ((original && original.layer>=2.75) || ismob(original)))
-						if(loc == get_turf(original))
-							if(!(original in permutated))
-								Bump(original)
+						if(!bumped && ((original && original.layer>=2.75) || ismob(original)))
+							if(loc == get_turf(original))
+								if(!(original in permutated))
+									Bump(original)
 					Range()
 					sleep(max(1, speed))
 		else
@@ -277,19 +279,20 @@
 					if(kill_count < 1)
 						del(src)
 						return
-					kill_count--
-					if((!( current ) || loc == current))
-						current = locate(Clamp(x+xo,1,world.maxx),Clamp(y+yo,1,world.maxy),z)
-					if(!Angle)
-						Angle=round(Get_Angle(src,current))
-					var/matrix/M = new//matrix(transform)
-					M.Turn(Angle)
-					transform = M //So there's no need to give icons directions again
-					step_towards(src, current)
-					if(!bumped && ((original && original.layer>=2.75) || ismob(original)))
-						if(loc == get_turf(original))
-							if(!(original in permutated))
-								Bump(original)
+					if(!paused)
+						kill_count--
+						if((!( current ) || loc == current))
+							current = locate(Clamp(x+xo,1,world.maxx),Clamp(y+yo,1,world.maxy),z)
+						if(!Angle)
+							Angle=round(Get_Angle(src,current))
+						var/matrix/M = new//matrix(transform)
+						M.Turn(Angle)
+						transform = M //So there's no need to give icons directions again
+						step_towards(src, current)
+						if(!bumped && ((original && original.layer>=2.75) || ismob(original)))
+							if(loc == get_turf(original))
+								if(!(original in permutated))
+									Bump(original)
 					Range()
 					sleep(1)
 
diff --git a/code/modules/reagents/oldchem/chemical_reaction/chemical_reaction_slime.dm b/code/modules/reagents/oldchem/chemical_reaction/chemical_reaction_slime.dm
index 4257b1c9be6..8894c903a27 100644
--- a/code/modules/reagents/oldchem/chemical_reaction/chemical_reaction_slime.dm
+++ b/code/modules/reagents/oldchem/chemical_reaction/chemical_reaction_slime.dm
@@ -491,11 +491,28 @@
 			var/obj/item/weapon/slimesteroid2/P = new /obj/item/weapon/slimesteroid2
 			P.loc = get_turf(holder.my_atom)
 //Sepia
+	slimestop
+		name = "Slime Stop"
+		id = "m_stop"
+		result = null
+		required_reagents = list("plasma" = 1)
+		result_amount = 1
+		required_container = /obj/item/slime_extract/sepia
+		required_other = 1
+		on_reaction(datum/reagents/holder)
+			feedback_add_details("slime_cores_used","[type]")
+			spawn(0) //otherwise the reagent won't be used up until after the full timstop is gone through.
+				var/mob/mob = get_mob_by_key(holder.my_atom.fingerprintslast)
+				var/obj/effect/timestop/T = new (get_turf(holder.my_atom))
+				T.immune += mob
+				T.timestop()
+
+
 	slimecamera
 		name = "Slime Camera"
 		id = "m_camera"
 		result = null
-		required_reagents = list("plasma" = 1)
+		required_reagents = list("water" = 1)
 		result_amount = 1
 		required_container = /obj/item/slime_extract/sepia
 		required_other = 1
diff --git a/code/modules/research/xenobiology/xenobiology.dm b/code/modules/research/xenobiology/xenobiology.dm
index a0df8e2740a..3fce14135e8 100644
--- a/code/modules/research/xenobiology/xenobiology.dm
+++ b/code/modules/research/xenobiology/xenobiology.dm
@@ -205,7 +205,7 @@
 /obj/item/weapon/sentience_potion/afterattack(mob/living/M, mob/user)
 	if(being_used || !ismob(M))
 		return
-	if(!isslime(M) && !isanimal(M) || M.ckey) //only works on animals that aren't player controlled
+	if(!isanimal(M) || M.ckey) //only works on animals that aren't player controlled
 		user << "<span class='warning'>[M] is already too intelligent for this to work!</span>"
 		return ..()
 	if(M.stat)
@@ -351,6 +351,81 @@
 	if(!uses)
 		qdel(src)
 
+
+
+/obj/effect/timestop
+	anchored = 1
+	name = "chronofield"
+	desc = "ZA WARUDO"
+	icon = 'icons/effects/160x160.dmi'
+	icon_state = "time"
+	layer = FLY_LAYER
+	pixel_x = -64
+	pixel_y = -64
+	unacidable = 1
+	mouse_opacity = 0
+	var/mob/living/immune = list() // the one who creates the timestop is immune
+	var/list/stopped_atoms = list()
+	var/freezerange = 2
+	var/duration = 140
+	alpha = 125
+
+/obj/effect/timestop/New()
+	..()
+	for(var/mob/living/M in player_list)
+		for(var/obj/effect/proc_holder/spell/aoe_turf/conjure/timestop/T in M.mind.spell_list) //People who can stop time are immune to timestop
+			immune |= M
+
+
+/obj/effect/timestop/proc/timestop()
+	playsound(get_turf(src), 'sound/magic/TIMEPARADOX2.ogg', 100, 1, -1)
+	for(var/i in 1 to duration-1)
+		for(var/A in orange (freezerange, src.loc))
+			if(istype(A, /mob/living))
+				var/mob/living/M = A
+				if(M in immune)
+					continue
+				M.stunned = 10
+				M.anchored = 1
+				if(istype(M, /mob/living/simple_animal/hostile))
+					var/mob/living/simple_animal/hostile/H = M
+					H.AIStatus = AI_OFF
+					H.LoseTarget()
+				stopped_atoms |= M
+			else if(istype(A, /obj/item/projectile))
+				var/obj/item/projectile/P = A
+				P.paused = TRUE
+				stopped_atoms |= P
+
+		for(var/mob/living/M in stopped_atoms)
+			if(get_dist(get_turf(M),get_turf(src)) > freezerange) //If they lagged/ran past the timestop somehow, just ignore them
+				unfreeze_mob(M)
+				stopped_atoms -= M
+		sleep(1)
+
+	//End
+	for(var/mob/living/M in stopped_atoms)
+		unfreeze_mob(M)
+
+	for(var/obj/item/projectile/P in stopped_atoms)
+		P.paused = FALSE
+	qdel(src)
+	return
+
+/obj/effect/timestop/proc/unfreeze_mob(mob/living/M)
+	M.stunned = 0
+	M.anchored = 0
+	if(istype(M, /mob/living/simple_animal/hostile))
+		var/mob/living/simple_animal/hostile/H = M
+		H.AIStatus = initial(H.AIStatus)
+
+/obj/effect/timestop/wizard
+	duration = 100
+
+/obj/effect/timestop/wizard/New()
+	..()
+	timestop()
+
 /obj/item/stack/tile/bluespace
 	name = "bluespace floor tile"
 	singular_name = "floor tile"
diff --git a/html/changelogs/halt-timestop-fox-mccloud.yml b/html/changelogs/halt-timestop-fox-mccloud.yml
new file mode 100644
index 00000000000..0fabcdcc094
--- /dev/null
+++ b/html/changelogs/halt-timestop-fox-mccloud.yml
@@ -0,0 +1,9 @@
+
+author: Fox McCloud
+
+delete-after: True
+
+changes: 
+  - rscadd: "Implements the timestop spell."
+  - rscadd: "Implements new sepia slime reaction which halts time in an AoE."
+  - tweak: "sentience potions no longer can make slimes sentient."
\ No newline at end of file
diff --git a/icons/effects/160x160.dmi b/icons/effects/160x160.dmi
index e540660bbe0..309a32e615d 100644
Binary files a/icons/effects/160x160.dmi and b/icons/effects/160x160.dmi differ
diff --git a/sound/magic/TIMEPARADOX2.ogg b/sound/magic/TIMEPARADOX2.ogg
new file mode 100644
index 00000000000..1a025a895b0
Binary files /dev/null and b/sound/magic/TIMEPARADOX2.ogg differ