So a friend and I were discussing the possibility of a character being able to cast enervation on the bad guy and transfering this excess power to one of our good guys. Is this possible?
Barring vampiric touch, which does this with (relatively easy-to-recover) hit points, I can't think of any spell effects that do this.
If you go on to create house-ruled spells, I'd put a "power-stealing" spell 2 levels higher (at a minimum) than the baseline de-buff you're using as inspiration.