Auras on weapons
This would be a great thing to make as a special kind of rare dye (but obviously you’d need to change dye so it can be applied to weapon skins as well as armor pieces). For a great use of auras, I’d check out the old City of Heroes game – they had great effects like “fire”, “smoke”, radiation", “sparkles” and others, all of which could be colorized. And not just for PvP, either…