Rune of Resonance

Bound Spell, Power Level (5/8). Range 12", Type Augment, Duration Permanent.
Once per Magic Phase, a single unit with at least one model affected by the Rune of Resonance may be chosen as an additional target of a Battle Rune that a friendly model is casting anywhere on the Battlefield (during step 1 of the Casting Attempt), with the following restrictions:
● A unit cannot be chosen if it is already a target of the Battle Rune.
● All instances of the Rune of Resonance on a unit immediately end when a Battle Rune is successfully cast on the unit.
● Characters that leave a Combined Unit are no longer affected by the Rune of Resonance.