If your army includes one or more Detachments with this special rule, you can, once per game, choose to re-use a Canticle of the Omnissiah (see the Appendix) that your army has already used earlier in the game.
If this Detachment is your Primary Detachment, you can re-roll the result when rolling on the Warlord Traits table in Codex: Cult Mechanicus
