Wight
What is your strategy for confronting the fantasy creature Wight in Dungeons & Dragons?
More info on this creature: Source 3
Fighting a single one of these is not common. The fact that someone killed by a wight rises up as a wight and joins its ranks makes these beasties pack encounters usually. Use your standard undead tactics against it.
Also these things are sneaky as heck: Hide +8, Listen +7, Move Silently +16, Spot +7