The Rift is an invisible realm of energy that surrounds all things and fills the spaces between the different plains of existence. The energy that fills this realm can sometimes be pulled through the thin veil that separates the mortal realm and the rift. However, the more Rift energy is pulled through the veil, the veil becomes thinner and can tear. As this happens, the spell become more and more unstable and drastically more powerful. Additionally, it becomes easier for creatures of the Rift to slip into the mortal realm.