kernel

Aschetic universe

A space used for practicing the most dangerous and deep-reaching wizardries, those intended to alter the kernel of a space, universe or dimension.

Abdals

Also sometimes referred to as "Pillars". The Manual says:

Kernel

A wizardly construct containing the master copy of the physical and wizardly laws governing a given volume of space. This master copy is a single complex statement in the Speech that lists all properties of matter and energy in that volume of space and the values to which those properties are set.