Originally posted by Enyalus
A well fed Nihilus is the kind of myth that Marvel fanboys like to use for a well fed Galactus.They've never been displayed so we technically can't judge them. Sadly.
That's not the average Force drain,it is unblockable by everything,only if you are a Wound in the Force you can stop it.
Source material specifically says that what he[Darth Nihilus] does cannot be taught. It's instinctual. Caused by him being on the surface of Malachor V when the mass shadow generator was activated. It's more than Force drain. The Exile does the same thing if you play darkside. It's separate from the popular Force drain.
By Kreia in KotOR 2. That's where she literally says it is not a technique that can be taught. And it's expanded upon in the Knights of the Old Republic Campaign Guide.