While I know true seeing can reveal ethereal creatures it doesn't seem to me like invisibility purge should work since it removes invisibility and being on the ethereal plane isn't an actual form of invisibility.<br/><br/>I don't know of any official sources that addressed this though.<br/><br/><br/>Also Myzriel is Abduxuel's official consort so the Matron knows what he looks like.  Green hair, silvery skin, a serpentine lower body. Abduxuel has been secretive about what Myzriel/Izerel can do and what his/their race is. He says Myzriel is an artificer of modest skill (true since he has 5 artificier levels) but no one (other than micar) knows he is a fiend of possession and not even Micar knows about Izerel. Any time Izerel is seen he just says he is Myzriel since they look entirely identical.<br/><br/>I doubt Myzriel's ethereal state is enough to make people realize what he is since he could have got there by any number of means.