Lacuna

Dark inter-bubble space resembling an egg carton of sunken bubbles in varying states of intact or popped. Features a red glowing horizon and constant icy winds. Acts as the exterior void between contained bubble worlds.

Lacuna emerges in Book 4 as the eerie, otherworldly void enveloping the Dungeon's bubble worlds, depicted as a vast egg carton of sunken, fragile bubbles adrift in dark inter-bubble space, lashed by icy winds and illuminated by a ominous red glowing horizon. This perilous exterior realm underscores the precarious isolation of each contained reality, serving as a stark reminder of the Dungeon's fragile architecture amid escalating threats from feral gods and system collapses. Though its full significance unfolds subtly across later books, Lacuna symbolizes the thin veil between survival and cosmic annihilation for crawlers navigating the series' climactic upheavals.