Ports explosive arrows from Lonestar (#461)

* Ports explosive arrows from Lonestar

* Explosive arrows balance tweaks

code/datums/components/crafting/recipes/recipes_primal.dm

@@ -327,6 +327,22 @@
 		)
 	category = CAT_TRIBAL
 	tools = list(TOOL_WORKBENCH)
+
+/datum/crafting_recipe/tribalwar/arrowexplode
+	name = "Explosive Arrow"
+	result = /obj/item/ammo_casing/caseless/arrow/explosive
+	time = 15
+	reqs = list(
+		/obj/item/stack/rods = 1,
+		/obj/item/stack/sheet/plasteel = 1,
+		/obj/item/stack/crafting/goodparts = 1,
+		/obj/item/stack/crafting/electronicparts = 1,
+		/obj/item/stack/crafting/metalparts = 2,
+		/obj/item/stack/cable_coil = 5,
+		/obj/item/stack/ore/blackpowder = 3
+		)
+	category = CAT_TRIBAL
+	tools = list(TOOL_WORKBENCH)
 
 //MELEE
 

code/modules/projectiles/ammunition/caseless/arrow.dm

@@ -74,3 +74,10 @@
 	desc = "An arrow made of wood, tipped with bronze. The tip is dense enough to provide some armor penetration."
 	icon_state = "bronzearrow"
 	projectile_type = /obj/item/projectile/bullet/reusable/arrow/bronze
+
+/obj/item/ammo_casing/caseless/arrow/explosive
+	name = "explosive arrow"
+	desc = "An arrow with a pressure-activated explosive charge at the end. Meant for breaching breaching or armored targets, but mildly effective against soft targets. Cannot be reused."
+	icon = 'icons/fallout/objects/guns/ammo.dmi'
+	icon_state = "arrow_explosive"
+	projectile_type = /obj/item/projectile/bullet/reusable/arrow/explosive

code/modules/projectiles/projectile/reusable/arrow.dm

@@ -99,3 +99,24 @@
 	armour_penetration = 0.05
 	damage = 30
 	ammo_type = /obj/item/ammo_casing/caseless/arrow/serrated
+
+/obj/item/projectile/bullet/reusable/arrow/explosive
+	name = "explosive arrow"
+	desc = "An arrow with a pressure-activated explosive charge at the end. Meant for breaching or armored targets, but mildly effective against soft targets. Cannot be reused."
+	armour_penetration = 0.3
+	damage = 15
+	ammo_type = /obj/item/ammo_casing/caseless/arrow/explosive
+
+/obj/item/projectile/bullet/reusable/arrow/explosive/on_hit(atom/target, blocked=0)
+	. = ..()
+	if(!isliving(target)) //if the target isn't alive, so is a wall or something
+		explosion(target, 0, 0, 1, 1)
+		dropped = TRUE
+	else
+		dropped = TRUE
+	new /obj/effect/temp_visual/explosion(get_turf(target))
+	return BULLET_ACT_HIT
+
+/obj/item/projectile/bullet/reusable/arrow/explosive/handle_drop()
+	if(!dropped)
+		dropped = FALSE