Gives the armblade some armor pen, to differentiate it from the claws

code/game/gamemodes/changeling/powers/armblade.dm

@@ -111,6 +111,7 @@
 	desc = "A grotesque blade made out of bone and flesh that cleaves through people as a hot knife through butter."
 	icon_state = "arm_blade"
 	force = 40
+	armor_penetration = 15
 	sharp = 1
 	edge = 1
 	pry = 1