A dark naga is a naga subspecies that looks like a large purple snake or eel with a barbed stinger at the end of its tail and a human face. Dark nagas can speak Common and Infernal. They like to plot with other creatures of evil alignment so that they can gather wealth more easily.
Dark nagas will attempt to use high terrain to their advantage to stay out of the reach of their enemies. They can cast sorcerer spells and their stings carry a poison that can induce a nightmarish sleep. They are resistant to all charm effects and have the permanent ability to detect thoughts. Similarly, their own thoughts cannot be read. Their veins contain an oily black gore.