Nether Void is a JA drk can get some really good usage out of, however in its current state its underwhelming. SE can use this ability to help drks strengthen the magical abilities to an acceptable level. There's a few change that I hope SE will consider:

Nether Void - Increase absorption of dark magic spells.
Duration: 2:00
Recast Time: 5:00

Nether Void also needs to enhance the absorption of "Dreadspikes." Increasing its absorption by the standardized 50%. In the event where you can cast Drain II twice, the raised HP capacity will not take effect until the original Drain II spell wears.