Offering of Blood

Acquisition
Signet of Capture:
 * Tonfor Copperblood (Lornar's Pass)
 * Morgriff Shadestone (Grenth's Footprint)
 * Jollen Steelblight (Frozen Forest)
 * Hormak Ironcurse (Ice Caves of Sorrow (mission))
 * Riine Windrot (Thunderhead Keep (mission))

Energy gain
This presumes Offering of Blood is cast as often as possible (activation + recharge time) before any activation/recharge time modifiers.

Related skills

 * (elite)
 * (elite)

Related articles

 * Gain/Lose energy skills quick reference
 * Sacrifice skills quick reference