Shadow snake

Shadow snakes were large, venomous snakes that lived in the jungles of southern Faerûn. They may have had some connection to the Shadowfell. Yuan-ti were said to keep shadow snakes as pets.

Description
Shadow snakes were twice as long as a human and had greyish-black skin that was shadowy in substance.

Combat
Shadow snakes were ambush predators that surprised prey by stepping through shadows. The bite of this snake could turn a victim's limb into a shadowy substance.