Draughr

Draughr are burrowing undead that look a bit like a Zombie but are thin and wiry and with most of the flesh gone. Their hands are long and the fingers are twice as long as human fingers and look sharp - like a moles’ claws.

They can bury beneath the ground and potentially tunnel to surprise their targets.

Like Zombies these just don't like to die, taking far more hits than you'd expect to put them down