War

War aka The Red Horseman is a very powerful entity. He has three siblings who have yet to make an appearance. Apparently he has the ability to mimic any human appearance. He is one of Lucifer's greatest weapons in the war against heaven. He is currently alive; Dean and Sam cut off his ring finger to stop the hallucinations.

Each other (Kindred)

Lucifer (leader)

Powers and abilities
Immortality

Shape Shifting

Able to make people hallucinate