Just throwing my 2 cents in here, and I know its been said a million times... But I may as well bump the thread and do my do diligence.

Give blood weapon 5 stacks and make it an 18 second buff. The fact that you cant get 5 gcds doing your SPELLS, which are a main part of your AOE is just lazy game design. Step it up Square, its hilarious how this falls through the cracks for nearly 3 years. If anything in DRK's kit needed a stacking gcd ability like Bushin, it was Blood weapon, not Delirium.