Walk of Echoes is a direct descendant of Warhammer Online's Public Quest system. Seriously.
Of course, it was a rather poorly-implemented take on it; I've voiced my reservations about the WoE revamp but hopefully the upcoming changes will bring it closer to PQs.
(also, Alhanalem: Warhammer Online has like a BAZILLION problems but Public Quests aren't one of them)

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