"Generally a spirit lingers near where its body is." It was something they had learned, something that left the Jedi - what was left of them anyway, and the Sith with cultural ties. Burn the dead. Or lock them away. "Some are angry about being dead, or how they died. Some want revenge. Some are simply confused or lost. Some are waiting for others, their family."

"It's pain, in general." Pain he felt.

Vader moved not quite smoothly. He had some experience doing this but not a natural as walking with them. But he can, even if it's awkward. "There are spells and rituals to bind a spirit to a place, I've used one, and some to resurrect a person. Those are much more difficult. I've haven't had success with those."