Arcane Reservoir

For 5 rounds, copy ANY spell cast within 30 meters and store it in your reservoir device, regardless of school or caster. Each spell stored extends the active window by 1 round. At any point during the active window, you can release stored spells using 1 Action each at no WP cost, using your own attributes for any calculations. Any spells remaining in the Reservoir when the window closes are converted into Willpower - you gain 20 WP for each stored spell remaining. Usable once per Rest.