Blood Spirits An Initiated summoner who knows both the Sacrifice and Invoking metamagics may learn to invoke Blood Spirits. A blood sacrifice and a bound spirit are needed. The ritual kills the blood sacrifice and the spirit becomes a great form blood spirit. In addition to all of the normal effects of Invoking (except the unique powers), the blood spirit also gains the powers of * Energy Drain (Essence), * Fear, * Natural Weapon (DV = Force Physical damage, AP 0) They also acquire the weakness of * Evanescence Essence drained by blood spirits is added to the spirit’s Force at a 1:1 ratio.