[GURPS] Powered by Threshold energy/Umanna enhancement/limitation

[starslayer]

If a threshold limited environment exists- what would the cost/savings be to have your abilities threshold powered instead of fatigue or ER powered.

For instance lets say I build Sam, the Super Firemage.

Sam lives in a world where threshold magic is the norm, and he is no exception. The world has 100 threshold with 10 threshold energy recovering each day.

Sam being a 'super firemage' ALSO has an innate attack to launch a 9d6 fireball, it has the magical modifier, and Sam's PC wants it to be draining of his magical resources, so costs fatigue does not fit; would whatever cost in fatigue simply be converted to threshold due to it being magical, is there some cost <due to the radical supply of energy which may be available> or some reduction, or simply a note 'powered by threshold', what if it can ONLY be powered by threshold, what if it can be powered by both?

[Crakkerjakk]

Originally Posted by starslayer

If a threshold limited environment exists- what would the cost/savings be to have your abilities threshold powered instead of fatigue or ER powered.

I'd just use the (Rev's) rules for Costs FP. Halved if it can use either FP or threshold.

[Darekun]

Originally Posted by starslayer

would whatever cost in fatigue simply be converted to threshold due to it being magical,

I'd construe it rather like ER — the cost is listed in FP, Sam being a threshold mage uses tally instead.

Originally Posted by starslayer

what if it can ONLY be powered by threshold,

This is the basic condition of threshold magic.

Originally Posted by starslayer

what if it can be powered by both?

Then he has Variable Energy Access, p79, Thaumatology. (Given the costs vis-a-vis Rapid Magical Recovery and Increased Threshold, I allow a "mostly FP" mage for 5 points, which has access to both, but 0% of the campaign Thresh and RR.)