As some of you MAY KNOW, the Boss enemy, Dark Weasel, uses 2 techniques:  Dark Wind Scythe -    Dark Slicing Wind -  What I would like to suggest is, Bosses that can cast jutsus should drop a scroll that can re-skin a specific jutsu to the dark version of it. The scroll would be one time use and tradeable.  Examples: Dark Weasel skins: Dark Slicing Wind Re-Skin Scroll Dark Wind Scythe Re-Skin Scroll Kiemon skins:  Dark Phoenix Fireball Re-Skin Scroll Dark Grea