Once this skill has been purchased, the character may expend any Signature Spell from memory to gain 10x the level of the spell in damage and gain the Body carrier for a single swing from behind. This may be done any number of times per day.
Example: Ena has purchased United Blow and has a 6th level Evocation Bolt in memory. She normally swings for “10 Normal” from behind due to her 4 Backstabs. She sneaks up behind an enemy and expends the Evocation Bolt to add 60 damage to a swing, calling “70 Body” for that one mighty blow.