Dragonskull Helm requirements changed to willpower

git-svn-id: http://svn.net-core.org/repos/t-engine4@3817 51575b47-30f0-44d4-a5cc-537603b46e54

game/modules/tome/data/general/objects/boss-artifacts.lua

@@ -135,7 +135,7 @@ newEntity{ base = "BASE_HELM",
 	define_as = "DRAGON_SKULL",
 	name = "Dragonskull Helm", unique=true, unided_name="skull helm", image = "object/artifact/dragonskull_helmet.png",
 	desc = [[Traces of a dragon's power still remain in this bleached and cracked skull.]],
-	require = { stat = { mag=24 }, },
+	require = { stat = { wil=24 }, },
 	level_range = {45, 50},
 	rarity = 280,
 	cost = 200,