Skearn

Skearns are often described as alternate universes. Their exact nature is somewhat of a mystery as neither the First nor the Renlai have any record of them. They appear to be a sort of interference, brought into play when two or more reins are brought all too close together, generating a region between them that shares properties of both - or, perhaps, entirely unique ones.

Many of them are quite malleable, and can be adjusted through sheer force of will alone, like controlling a lucid dream.