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Message: <blockquote data-quote="Mephista" data-source="post: 7142819" data-attributes="member: 6786252">There were lots of storyhooks, as well as powers and epic destinies, in 4e towards this very effect.  Its part of the game's lore, even if you've never done it for your game.   Just sayin'.In terms of 5e, warlocks do get the Imprisonment spell as well as the True Polymorph spell at 18th level.  You can turn yourself into a fiend or fey if you want, and you have the necessary spell to sustain lichdom.   So, its entirely possible to do as a warlock (though using your level 9 magic to just sustain lichdom hurts).</blockquote>