Adnalam, the Shattered

Adnalam, the Shattered is a member of The Fallen who represents Darkness, Destruction, Hunger, and Madness. He is most often portrayed as a formless black void. His symbol is a smile made out of chains. He dwells on the plane of Pandemonium.
Adnalam's archenemy is Zavriel, the Equal Arbiter.

Evil clerics who are dedicated to the domains of Death, Tempest, and Trickery can serve Adnalam.