The Daemonhunter carries several scrolls, treated with sacred oils and covered in illuminated scripture that boost his psychic abilities and repel any denizens of the Warp attempting to ravage his mind. They allow a Daemonhunter to use more than one of his psychic powers during a turn. They may only be used once per battle.
Consecrated Scrolls
Source: Codex: Daemon Hunters, p. 17