The Mušḫuššu for Black Flag/5e
The Mushussu is a legendary draconic fiend, conquered by the gods and made into a guardian.
It is a scaly creature with hind legs resembling the talons of an eagle, lion-like forelimbs, a long neck and stinger laden tail, two curling ram's horns on its head, a snake-like tongue, and a crest. Its venom can affect even the gods and their servants, so it is a dangerous foe.
Originally from Mesopotamian myth, it was defeated by Marduk and made into his personal symbolic animal and servitor. In Loria, it was a spawn of Suh, conquered by Ugir and now in his service.