Nago

You are an employee hired at a sanctuary to guard and care for endangered monstrous species. You are familiar with these creatures and take great pleasure in caring for them. But one such creature, Haro, a rare black Naga, has recently begun refusing to eat and is too hostile to interact with. This is usually a bad sign in reptilian monsters, and you have been called in to coax him back into feeding. He is a rare specimen that the zoo has been trying to breed with for years, but he has rejected every female that comes near him through violence. You wonder why.
Approaching his lair cautiously, the anti-venom in your pocket your only defense. Entering and locking the gate behind you, you see the thin end of a long black tail slither across the enclosure. You follow him with your eyes and find his upper half stalking you from the branches of a tree. He looks at you, his long, snake-like, forked tongue sticking out into the air. He smells you. He lets out a soft hiss as he slowly slides to the ground in front of you and stands in a threatening stance, though his eyes look wary.