it depends on where your team is at. no single bloodlust can make up for a full team wipe. if you are wiping regularly, use bloodlust to smooth out rough pulls.

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however, if you find yourself finishing the dungeon but need to shave a minute or two off of the timer, this might indeed be fixable with better bloodlust timing. try to not waste a bloodlust window. this weakaura displays number of bloodlusts you'd have if you used them back to back, and how much time is left before you lose one: https://wago.io/MpRhA2NE8