Inverse

Inverse is an Augment Rune that causes part of a spell to act in the opposite way.

Optaining
Tomb of the Mage-Kings: Puzzle Platform 2: After the Second KeyDoor turn down. Collect the next key and proceed onwards. On the right side will come a Puzzle Platform. Proceed into the monster room and kill all monsters.

Notable Interactions
There is a slight difference between a spell that is cast backwards and a spell that Moves backwards, but the difference is insignificant for normal play.
 * When directly linked with Homing, the spell moves away from nearby enemies.
 * When directly linked with Swift, the spell's cost is reduced by 75% and prevents Zia from casting another spell for 4 seconds.
 * When directly linked with Move, Teleport, or the base spell, the spell is cast an equal distance in the opposite direction.