Please, review Blood Weapon buff time

[Quor]

Part of the problem with Delirium vs. BW is that Delirium resolves skill usage client-side, whereas BW resolves the MP gain server-side. This means as long as you, on your screen, get a 5th hit in under Delirium, then it'll hit, even if the "hit" doesn't register until after the Delirium buff is done. As long as the skill and GCD are triggered before the buff wears off, you're good to go.
BW doesn't do this. Since it's resolved server-side, you need to actually hit the target for the BW MP gain to resister. Given that most DRK attacks are a bit on the "slow wind-up" side, this make it very easy to miss that 5th attack under BW. The best solution IMO would just be to have BW grant 5 charges of +600 MP gain for the next any-GCD skills used, with a 15s timer on the charges. This gives us ample time to get all 5 hits in with a bit of wiggle room on top of that for contingencies.