Signet

Signets are special skills that don't require mana. These include, but are not limited to: Resurrection Signet, Signet of Capture, Bane Signet, etc.

Signets take time to cast and time to recharge, but are often useful as they can be cast without worrying about your mana. This alone is helpful. A non-monk should usually carry a Resurrection Signet if he is heading out in a party.