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I have just looked at the blood angels errata because I'm having a game against them tomorrow, I noticed that it says the librarians are masteryy level 1 but I couldn't find where it says what book powers they can roll for. Is there anything about it in a white dwarf or can they only take blood angels own powers.

Its in the Blood Angels FAQ, under Psychic Powers

Yea, not sure how you missed it.

From the BA FAQ.

PSYCHIC POWERS
A Blood Angels Librarian (including Mephiston) may use the
psychic disciplines found in the Warhammer 40,000 rulebook,
instead of those in Codex: Blood Angels. If he does so, generate
two new powers from the Biomancy, Divination, Telepathy or
Telekinesis disciplines (in any combination) before armies are
deployed.

OK I see it now. I was expecting it to be in magenta so I completely missed it. Anyway thanks, this makes my blood angel gun line much better.