Slipspace is a 7th dimension parallel to ours. It is not a universe, rather, it spans the entire Trolliverse and beyond. It can only be accessed by rupturing space and time, a technique that the huemens, the Cuveenent, and a few other people have accomplished. It was mostly used by the Huemens and the Cuveenent during their war to go from one area to another, though slipspace drives were used to rupture space and time, and they were basically ticking time bombs. The Void can produce a portal to slipspace by being in Giga state, or being in Normal State with heartburn.