Bone golems are undead constructs made of bones. They are one of the deadlier types of undead employed by the Scourge. Their long, scythe-like arms can cleave through the heaviest of armors. Fortunately, despite their strength, they seem to be rather rare. The Taam rune is often used in their creation.
They spawned in large numbers and in unlikely places during the Scourge Invasion event, for instance in Silithus.
In the RPG
Appendix Three of Manual of Monsters describes a diferent type of bone golem, however, the validity of the source is disputed.