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code/modules/ninja/ninja_explosive.dm

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+/**
+  * # Spider Charge
+  *
+  * A unique version of c4 possessed only by the space ninja.  Has a stronger blast radius.
+  * Can only be detonated by space ninjas with the bombing objective.  Can only be set up where the objective says it can.
+  * When it primes, the space ninja responsible will have their objective set to complete.
+  *
+  */
+/obj/item/grenade/plastic/ninja
+	name = "spider charge"
+	desc = "A modified C-4 charge supplied to you by the Spider Clan.  Its explosive power has been juiced up, but only works in one specific area."
+	boom_sizes = list(4, 8, 12)
+	var/mob/detonator = null
+
+/obj/item/grenade/c4/ninja/afterattack(atom/movable/AM, mob/user, flag)
+	var/datum/antagonist/ninja/ninja_antag = user.mind.has_antag_datum(/datum/antagonist/ninja)
+	if(!ninja_antag)
+		to_chat(user, "<span class='notice'>While it appears normal, you can't seem to detonate the charge.</span>")
+		return
+	var/datum/objective/plant_explosive/objective = locate() in ninja_antag.objectives
+	if(!objective)
+		to_chat(user, "<span class='notice'>You can't seem to activate the charge.  It's location-locked, but you don't know where to detonate it.</span>")
+		return
+	if(objective.detonation_location != get_area(user))
+		to_chat(user, "<span class='notice'>This isn't the location you're supposed to use this!</span>")
+		return
+	detonator = user
+	return ..()
+
+/obj/item/grenade/c4/ninja/prime(mob/living/lanced_by)
+	. = ..()
+	//Since we already did the checks in afterattack, the denonator must be a ninja with the bomb objective.
+	if(!detonator)
+		return
+	var/datum/antagonist/ninja/ninja_antag = detonator.mind.has_antag_datum(/datum/antagonist/ninja)
+	var/datum/objective/plant_explosive/objective = locate() in ninja_antag.objectives
+	objective.completed = TRUE