Walk Between Worlds is an augment spell that targets a single unengaged unit within 24". The target gains the Ethereal special rule until the end of the phase and can immediately move up to 10" as if it were the Remaining Moves sub-phase. The Wizard can choose to cast a more powerful version of this spell, in which case the target instead gains the Ethereal special rule until the end of the phase and can immediately move up to 20" as if it were the Remaining Moves sub-phase. If he chooses to do so, the casting value is increased to 16+.