Given how amazing the librarians powers are for a small army count like grey knights, it seems like a "mandatory" HQ choice, or at least that's what everyone keeps saying.
My huge problem with this unit stems from my local gaming group. There is an Eldar player who has, with great joy, changed his lists to always include that rune on his farseer that makes you roll psychic tests with three dice (forgot what it was called, and it's exact ability), and will have it camp in a holo-falcon all game zipping around for cover saves.
Needless to say, I'm a bit frustrated by this and really don't want to play at his game by arranging my list, so my question is thus.
Is the psychic hood on the librarian good enough to counter that ability, or is it static? Does psychic hood save you from things like shadow in the warp too or not? I'd really like to use this unit, especially since I'm making my own, but if this is a losing uphill battle then I'll have to rethink my list ideas.
Thanks!