The Altarca is a barrel magnitudes bigger than the Monocosm. Like its smaller barrel form, it has altarchaic strings that vibrate and keep the barrel stable.
Unstable Altarca[]
If the Altarca were to become unstable, it would probably be the end of reality as we know it. All the monocosms would wander around in the sub-kelvin temperatures of Metempiric Space, slowly shedding away their laws of physics and all instances of life.
Fortunately, it has never happened, since the strings are much more durable than those of the Monocosm's. It has been predicted that the chance of the Altarca becoming unstable is 1 in 10↑↑↑↑↑↑↑↑↑24.
Kardashev Civilizations[]
It can be hypothesized that a Type 13.0 Civilization can reside in the entirety of the Altarca.