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The Tome may only be used by the AMs Chapter Master, Head Chaplain, or Chief Librarian, no other AM has the strength of will to bear it into battle.
When one of these characters is equipped with the Tome, all AMs on the board get +1 WS, +1 Str, +1 Attack, and +1 I. Versus any Slaanesh-aligned models, they get twice that.
Also, any non-Space Marine, non-Inquisition, non-Necron, non-Chaos models (this includes allies) within 24" of the Tome receive -1 attack (to a min of 1), and -2 Ld.
At the start of each battle in which the Tome is used, all non-vehicle Angry Marine units must make a Leadership save, if they fail, for the rest of the game they will count as having an Initiative of 1 (but the Tome's ability still applies). If a Psyker fails the test, in addition to the reduced initiative, they also suffer a Perils of the Warp attack, due to the sudden visions of unbound, hemaphroditic, hedonistic, and unrelenting Yiffing.