Arachne

An arachne was a powerful cleric of Lolth. The arachne called upon Lolth's power only to dominate everyone else in drow society.

Abilities
An arachne gained a hairy spider as a familiar and could later see through its eyes.

An arachne eventually gained a giant spider to serve as her mount.

An arachne gained the ability to create a type of undead called a zin-carla and command it to do her will.

An arachne of the greatest power became divine in nature and effectively immortal. She could also assume the shape of a yochlol.