Originally posted by jjrobinson2:

The size of this encounter was unprecedented for my level.

I thought Wraiths were supposed to be exclusively nocturnal.

If aggroed on a target a night spawn will stay alive until it wins, loses, or gets confused and loses the target, then it will despawn. if chasing a fast deer or the like, they can linger a bit past morning. Typically you get a hit or 2 and it despawns to prevent loot.