Orbs are used by the mystic class as their ability.
Orbs will freeze enemies, longer as the tiers increase. While enemies are frozen, the are invulnerable and cannot move. Because of this, most people feel that orbs are underpowered. Orbs most commonly provide a means to escape a god-wall. Sometimes, however, people use the orbs to troll other people, like keeping some enemies in stasis during a cemetary event.