Necro power transfer should not transfer more power than the target needs.

Tested on Pendragon:

1. Used Power xfer on NPC -> no power transferred (no cost for the spell itself on Pend)
2. Used power xfer on friendly Shaman missing a small amount of power. Transfer gave only partial power rather than subtracting full value from caster.


Test on Phoenix

1. Use power xfer on NPC -> full value transferred from Necro, total of 130+ loss with highest level transfer used.
2. Use power xfer on friendly. Even if target is missing a small amount of power, the entire transfer value will be subtracted from the Necro.


https://gfycat.com/poisedconcreteastarte (vid is of effect on NPC and full power targets only)