Manipulate Magic

MANIPULATE MAGIC
Type: M Action: Complex
Range: Touch Duration: Permanent

The critter can transfer magic into or away from a ritual or preparation. They must make an Alchemy + Magic [Astral] vs. Potency x 2 Test for preparations, or a Spellcasting + Magic [Astral] vs. Force x 2 Test for rituals, to manipulate the potency or Force of the object/spell in question. The critter can then raise or lower the potency or Force by 1 per net hit. Once a ritual has expired or a preparation has cast its spell, the critter can do nothing to bring that power back.

(p193 HS)