Maybe you should add items to give this effect too here is my idea:
Mana Engine: Sets speed to 0 and gives +x% ability damage and +x mana regen.
Bouncy ball: Attack has x% reduced damage but bounces up to x targets dealing x% less each bounce
Yeah that would be really cool, maybe you should add a present event for Christmas, where players can open gifts containing either a normal battle, a elite battle, aurite/egg, some aura, or a item of random rarity, which could include limited edition skins and items. Once you get those items you unlock them from events that could give you items (shop, stash, etc).