The Venomspire Relic

The Maw is the widest known way down into the Deep Vaults and the Cartomancer keeps it, but before the Cartomancer there was this. The archivists file it as the Maw's first keeper, a spire the pilgrims prayed to on the way down and did not pray to on the way up because none of them came up. The Blood-Oath Serpent Blade was sworn on it. Handle with appropriate reverence.

Structural antiquity, layer by ritual layer. In the public record.