At first, the Quantumverse might just seem like another crappy, self-containing page. However, this is only partially the case; The quantumverse can not only contain infinite amounts of itself and anything bigger than it, it can also break all laws of... everything, by containing other self-containing objects, such as The Box, Pitch Black, Space Time Web, Blue Void, etc. The Quantumverse is the absolute biggest possible thing in the entire Quantumverse. Anything bigger will not only be immediately contained by it, but destroyed as well. It will also contain any object that claims to bypass this rule, and that rule, and that rule, etc. If it passes every of the infinite rules, then it will still be contained.
Inside the Quantumverse is every single possible thing imaginable, unimaginable, etc. The temperature of this verse is VERY high, the lowest temperature's being somewhere in the low Omninfinities. However, life does exist here in many forms. For example, The Heat Beast is an entity that lives here, and it can survive because it was specifically made to survive Omnifinity level temperatures and a bit beyond it as well.
The Quantumverse has a weird property, that even though it contains itself, "Itself" is actually another, bigger verse.