Illidan's Forces (also known as the Illidari) was the group of united forces of Illidan Stormrage, Kael'thas Sunstrider, and Lady Vashj. The army was originally created to destroy the Lich King, on orders of Kil'jaeden; however, the Scourge countered the Illidari, and Arthas Menethil forced Illidan to retreat to Outland.
- Illidan Stormrage - Reigning leader of the Illidari. Died at the hands of Maiev Shadowsong and Akama.
- Lady Vashj - Leader of the Naga of the Illidari. Died at the hands of the Cenarion Expedition.
- Kael'thas Sunstrider - Leader of the Sunfury, the Sin'dorei in the Illidari. Betrayed Illidan and joined Kil'jaeden.
- Akama - Leader of the Broken. Rebelled against Illidan to take back the Temple of Karabor.
- Kargath Bladefist - Warchief of the Fel Horde which served Illidan. Was slain by adventurers.