Path of Exile Sanctum won't be permanent yet, but GGG wants it to be

The Path of Exile Sanctum league has proven to be a hugely popular addition to the long-standing hardcore RPG game, grabbing player attention after a series of somewhat underwhelming expansions with the introduction of its roguelike dungeon The Forbidden Sanctum. It's been so good, in fact, that developer Grinding Gear Games wants it to be a more permanent part of Path of Exile - but it won't come in PoE update 3.21.
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