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Originally Posted by jeff_wilson

Steal Power only refills your FP from a battery, it doesn't add to what you would have by resting alone.

I think you could use it to power a Hung spell and would think for a campaign with this a few variants would exist.
Either one that lets you draw upon a battery when casting or to fill a pool you can tap when casting.
And while were at it a variant of the Ley line spells that draw more power too.
The ones in Urban Magic are pretty anemic.
That fits most settings but something like the Gryphon series where a Ley line tap can kill you should be possible as well.
Just for different settings.

Originally Posted by Jerander

For the sake of clarity, you can use:

Where do things like the energy boost offered by Spirit-Assisted Magic and Threshold Magery (Variable Energy Access) go? Are they external or can you use them in addition?

Thank you,
Jerander.

I would say either way with Spirit Assisted. They could count as extra like assistants or they could require concious effort at the end and thus be limited.
Threshold would typically be treated like an ER in my opinion and allowed but I doubt two thresholds would fit most settings.