Portal

Spell effects
Portal is an environmental spell that creates an orange/blue portal that links to the other. Passing through the portal will let you out through the opposite side of the opposite portal, conserving momentum. The same can be done with projectiles, lasers, enemies, and minions.

Pros

 * Fun to play with.

Cons

 * Not very useful for combat or transportation.

Trivia

 * Obviously a reference to the Valve games: Portal and Portal 2.