Almost sure it casts some kind of AE dispell regularly, which affects itself. So no point buffing before the fight, no point slowing it, and no need to dispell its DS. Although it is a wizard, it is still a level 53 so it has quite a chunk of hp, 18khp according to wiki. It will absolutely spam rend, ice comet, gflux etc until it runs out of mana. If you have an expensive clicky, you can single pull it easily, every time, when it doesn't resist.
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