The Undead are a special type of monster. They're often used by the Darklords of Helgedad; the Helghast is a relatively common elite soldier. However, undead have no standard allegiance. Though most commonly found under the sway of an evil commander, they can sometimes be encountered freely roaming. The Sommerswerd, being a holy artifact, tends to make short work of undead, dealing double damage to them. Lone Wolf can also acquire a Dessi Stone in The Deathlord of Ixia from Banedon, which empowers a normal weapon to do double damage to undead.
Some undead may be resistant to nonmagical weaponry and mental attacks, such as Mindblast.