He’s been around a while- he knows high nails get hit with a hammer. He knows from past experiences that a lich with an ostentatious hoard and doing all kinds of nasty things is a tall nail, soon to be hit by adventurers. (“Meddlesome kids!”)It never occurred to me at the time, but looking back I wonder why an evil wizard would go through all the rigmarole of attaining lichdom just to lay down in his pyjamas in a random tunnel in the middle of the Underdark, surrounded by only a few magic mouths:
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So he decided to lay low- literally- for a few centuries.