new cult whetstone sprite

code/game/gamemodes/cult/cult_items.dm

@@ -192,13 +192,15 @@
 /obj/item/weapon/whetstone/cult
 	name = "eldritch whetstone"
 	desc = "A block, empowered by dark magic. Sharp weapons will be enhanced when used on the stone."
-	icon = 'icons/obj/cult.dmi'
-	icon_state = "cultstone"
+	icon_state = "cult_sharpener"
 	used = 0
 	increment = 5
 	max = 40
 	prefix = "darkened"
 
+/obj/item/weapon/whetstone/cult/update_icon()
+	icon_state = "cult_sharpener[used ? "_used" : ""]"
+
 /obj/item/weapon/reagent_containers/food/drinks/bottle/unholywater
 	name = "flask of unholy water"
 	desc = "Toxic to nonbelievers; this water renews and reinvigorates the faithful of a cult."

code/game/objects/items/weapons/whetstone.dm

@@ -47,6 +47,7 @@
 	name = "worn out [name]"
 	desc = "[desc] At least, it used to."
 	used = 1
+	update_icon()
 
 /obj/item/weapon/whetstone/attack_self(mob/user as mob) //This is just fluff for now. Species datums are global and not newly created instances, so we can't adjust unarmed damage on a per mob basis.
 	if(ishuman(user))