Sanctum

Sanctum is the fifth floor in the facility, characterized by its runes and brick makeup. It is mostly inhabited by Constructs and Machines, with some Mages. There are very few Undead, though some are spawned by Soul harvesters and Ghost lamps. Unlike previous floors, the player is able to end a run after defeating the boss, or they can go deeper if they have obtained all four Seals

Trivia

 * Some imagery in Sanctum indicates that the Monolith event has already happened in the past or has been foretold.