The Ossuary occupies the decommissioned lower level of a Tier 1 municipal water recycling station beneath the Kessler Stack, a residential megablock in the deepest Shelf. The space is raw concrete and corroded pipe — walls dripping with condensation, the ceiling a dense tangle of reclaimed cable and salvaged lighting rigs that pulse in time with the music. Capacity is rarely counted; estimates run between 200 and 400 depending on how desperate the crowd is. There are no seats. The floor is uneven. Two people have died here from structural accidents, and both are considered martyrs of the scene.

The Ossuary has no fixed location in the traditional sense — it occupies the same physical space, but access points rotate on a two-week cycle, communicated through encrypted mesh bursts to trusted contacts. Corporate security has raided the water station three times since 2208; each time they found nothing but old pipe and standing water. The venue's sound system is entirely custom-built from salvaged industrial hardware and consumer-grade neural broadcast emitters, producing a bass response that the regulars describe as 'feeling like the building is swallowing you.' Notable events include the 2211 debut performance of Rua Negra, which drew a crowd so large the venue's structural supports were visibly flexing by the third set.