Zach Yonzon reported on the above video a few days ago featuring a Warlock's Voidwalker pet tanking the 10-man version of Sartharion with all three drakes up. Needless to say, it's one of the coolest things that I've seen in the game. In the comments Falcrist lists off a few good reasons how this became possible:
- Best in slot gear for increasing the Voidwalker's HP and relevant tanking statistics.
- The Voidwalker got a lot of alone time with Sartharion, probably in the range of 5 or so minutes, during which the Voidwalker is building up massive amounts of threat.
- Pets have 80% passive AOE resistance, so Sartharion's breath really doesn't hurt them at all (and especially at 90,000 HP).