The Possession ability is also Supernatural, however, and so being under a constant antimagic effect would presumably render attempts at possession or magical influence a bit more difficult, as well.  On the bright side, Nyag'thon's character sheet shows that her Symbiosis abilities are mostly either Extraordinary or Natural in nature, so they should work just fine.<br/><br/>Also, while Muramasa might want to stop and taunt Solana for a while, Torahime has little interest in her, as well.  Perhaps she might be able to work with Galyxx on hunting down Grimjaw...