Necrophidius

Skeletal snakes with humanoid skulls. They're bite can paralyze and their gaze can hypnotize. It's been rumored that the secret to making these foul undead constructs has been lost for thousands of years, but apparently, not so lost that someone couldn't find it.

Four slithered ashore near Chrysopolis. Mermen reported that they had seen them coming from the East. Of course, they reported that after the Necrophidii had arrived.