Tyrael

"Tyrael, he was. Good fight, too. They didn't call him Felbane for nothing."

- Malygos recalls Tyrael

Tyrael, nicknamed Felbane, was a high-ranking angel of the Celestial Planes.

History
Tyrael battled Malygos and Mephistroth when the two of them invaded the Celestial Planes with a troupe of demons in their younger days. Tyrael fought Malygos and Mephistroth vigilantly, but was no match for the two of them together and was slain. The leadership of the Celestial Planes subsequently put a bounty on Malygos and Mephistroth's heads that remained open well into the present day.

In 150,083 CMT, Malygos and Mephistroth boasted about their battle with Tyrael to Shikhazra at the Mad Scientist Convention.