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The old archmage always hated adventurers; the way they'd talk over him while he tried to give them important plot points at an inn, or how they'd always jack up the price for protecting an orphanage from extraplanar cannibals, that sort of thing. So he built a fabled tomb in the middle of lizardfolk controlled swamp, solidly full of death traps, purely out of spite, and his actual body rests peacefully beneath a simple stone in a flower bed he planted, far from anywhere remotely adventurous.
@Leucrotta accidentally built a theme park for adventurers is what he did