The Tomb of Sargeras is one of the most difficult overall levels to play, but out of the first 11 levels, the most difficult one to speedrun to make a good time. A lot of things have to be done at the same time and due to 3 separate islands, the demons in the center and scattered giant turtles, you can easily lose your time if not paying attention to all these little details. Bloodlust makes things easier.