Dark naga

A dark naga was a naga subspecies that looked like a large purple snake or eel with a barbed stinger at the end of its tail and a human face. Dark nagas could speak Common and Infernal. They liked to plot with other creatures of evil alignment so that they could gather wealth more easily.

Description
Dark nagas measured approximately 12 feet long and weighed about 300 pounds. Their scales were dark blue or purple, often with black frills or scale patterns. The body of a dark naga was more similar to that of an eel rather than a snake. Its tail ended in a poisonous stinger.

Their veins contained an oily black gore.

Society
Dark nagas craved power and wealth. They loved using their magical powers and the treasures they found in ancient ruins to rule those who were weaker than themselves.

Combat
Dark nagas would attempt to use high terrain to their advantage to stay out of the reach of their enemies.

Abilities
They could cast sorcerer spells and their stings carried a poison that could induce a nightmarish sleep. They were resistant to all charm effects and had the permanent ability to detect thoughts. Similarly, their own thoughts could not be read.

Allies
The Zhentarim were known to use dark nagas as mentors and leaders for bands of orcs.