Thing with Carabosse and Onvi abilities is that not only can THF steal 1 of their abilities every 5mins, but guess what...so can DRK. Difference is DRK can do it every minute, and using Nether void can steal an additional 2 buffs at the same time. So THF's 5min JA that can only steal 1 buff is OP, but DRK`s 1min recast spell that can steal 1-3 buffs is legit. And before anyone says "but spells can be resisted" Aura Steal isn't 100% either.
