Have you tried doing what DPS you can to deathwing, first add wave spawns, kill that, then control burn to 11% and stop, kill second add wave, then hit lust and burn deathwing from 11%? Corrupted Blood increases damage based on what % he's at and it increases at 15%, 10% and 5%, so if your dps isn't enough to just do 1 add wave, then you want to hold dps at 11% and do a second add wave.
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