Originally Posted by
Mionelol
Instant death. There are many ways to get on top of the platform (well, at least 3) while solo, but all of these but one way (the one used in videos) do not allow to kill Thorim, because he will never get into p2 even when you get on top of his platform.
That being said, there is still one way to kill him without bugs, but I'm not sure if it will count as a victory. You could theorically DPS thorim down without ever leaving the arena. He has a 99% damage reduction shield, and around 4M hp (or something approaching). Mobs are definitely tankable during enrage (I can survive for a long time at 85, at least at level 90 it's very easily survivable). It'd take multiple hours, but hey, you asked!