He nods, still absently spinning the flute around his fingers. "A little of both, I would say. Resentful energy is formed in a violent death, or an angry one. It is rage, or hatred. It is a desire for revenge. It is not mindless, but it is not as...hm." He pulls his mouth to one side, thinking it through. "As complex as a living person, most of the time."

There are exceptions, of course. Like Wen Ning. But sometimes, what happened with him feels like such a perfect confluence of events that Wei Wuxian wonders if he could ever recreate it.

"That is why I do not think I could draw it from the dead that walk here."