Sometimes known as ankylos, the mace tails are large, armored reptiles with heavily armored tails that serve as clubs. Mace tails have been used in combat, where whey can have ballistae mounted on their backs to provide support to infantry or cavalry units.

They exist in most forested regions of Gaeleth, living off of a variety of vegetation, insects, and the occasional corpse of a larger animal. They have rapid, indeterminate growth; from a clutch of a dozen eggs, they can reach maturity in just six years with a good diet. They imprint well on most humanoid races, but their large food requirements often relegate them to military or specialized services, only.