Again, your party makeup determines how to kill him. As someone already said, Mordakainen's Sword is great. For any tanks, make sure to use Greater Whirlwind. If you've got high level mages (or a high level mage), a Spell Trigger of Lower Resistances, followed by a Chain Contingency of Abi Dalzim's, is a good idea. He's also vulnerable to Time Stop, so if you get into a bad situation cast that to get a chance to breathe.
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