The Ossilyth is a heavy-hitter among undead minions. Undead are normally valued for their cheap, disposable natures. However, occasionally one needs something a bit more substantial to crush ones opponents, and this is the exact purpose for which Warmaker began raising Ossilyth minions.
Standing a solid 2.5 meters in height, almost every inch of an Ossilyth is covered with hyperdense bone, magically gathered and compressed into a ridiculously strong armor plating. Arrows and swords will bounce right off, while war hammers and mauls will merely chip and scratch the surface.
No weapons were deemed necessary for these creatures; Warmaker relied on the sheer mass of their blows to deal damage. As such they have no hands, and in their place sit large bone-hammers.
The face is perhaps the most disturbing part of an Ossilyth: it has none. Where the face would be is just a blank mass of bone armor.