Restrain
Tristan was in a half-conscious state, barely discerning his surroundings, when he had found himself chomping at the elder's neck and spat it out like a tiger finishing its meal of a venison. Moreover, he felt such a sensation of fulfillment as the blood spilled into his mouth and flowed through his throat.
At this moment, his mind began to wonder if this legacy transformation was influenced by the beast mentioned by Virtaz. As he had no clear recollection of it throughout his previous journey down the memory lane, Tristan eventually concluded this must be part of the next memory fragment.
One dead elven elder gave him another 2000 Blood Essence, a joyful matter. But from what he had seen so far, this amount of Blood Essence would probably only allow him to maintain this transformation for one minute or two minutes at most.