The Forgotten Basilica

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“

What memories died with the Eridians? And who will bear the weight of remembering?

— In-game description

”

The Forgotten Basilica is a location on the planet of Promethea in Borderlands 3.

Background

This is the location of the Vault on Promethea and where the fight against its vault monster, The Rampager, takes place.

Rhys mentions that Atlas was paved over this Vault, although he has refrained from opening it to prevent unforeseen consequences.
Title given by the game is "Eridian Ruin".

Borderlands 3

Athenas	Athenas

Eden-6	Ambermire • Blackbarrel Cellars • Floodmoor Basin • Jakobs Estate • The Anvil • The Floating Tomb • Voracious Canopy

Nekrotafeyo	Desolation's Edge • Tazendeer Ruins • The Pyre of Stars

Pandora	Ascension Bluff • Carnivora • Cathedral of the Twin Gods • Covenant Pass • Destroyer's Rift • Devil's Razor • Guts of Carnivora • Konrad's Hold • Sandblast Scar • The Droughts • The Great Vault • The Slaughter Shaft • The Splinterlands

Promethea	Atlas HQ • Cistern of Slaughter • Lectra City • Meridian Metroplex • Meridian Outskirts • Neon Arterial • Skywell-27 • The Forgotten Basilica

Sanctuary	Sanctuary III

Non-Campaign Areas	Gradient of Dawn • Ghostlight Beacon • Precipice Anchor • Slaughterstar 3000 • The Hall Obsidian • The Skydrowned Pulpit • Wayward Tether