Amphisbaena

An amphisbaena resembled a pit viper with, instead of one head, two of them at each end of its body.

Physical description
An amphisbaena's skin molted just like other snakes, and little horns above each eye helped it to shed its skin. The skin of an amphisbaena had the same variation as found in normal vipers.

Amphisbaenae slithered sideways just like other snakes. It could step up its pace of movement by grabbing its own head with the other and rolling like a hoop.

Combat
In combat, amphisbaenae could use both heads when snapping at opponents simultaneously. This enabled the monster to attack and defend at the same time. Its bite, when successfully piercing the armor of its opponent, could transform flesh into stone.

Using this ability, an amphisbaena would attempt to bite its own head with the other upon impending death, so to turn itself into stone.

Location
Sages documented the hatching of a clutch of amphisbaenae in the town of Chariton in Battledale in the late 14 century DR. The townspeople were proven ignorant to the danger when the unattended amphisbaenae grew to immense proportions and slaughtered most of the town's inhabitants. Since that time, the town of Chariton was a ghost town. It was said that the amphisbaenae left the town after they had depleted it as a source of food and moved on to the forests near the Pool of Yeven, the Deeping Stream, and Lake Sember.