Vahl

Vahl is the leader of the Vahl faction of Fallen.

Appearance
He has the appearance of a bear.

Background
In the same way Eulerex, he was a fallen that Diablo knew in Cross Reverie.

Eulerex
He thought of the Vahl faction as an inconvenience that was of no use.

Faction
Although it has never been shown, his associates were known for the desire to slaughter the races, many of them were killed when Modinalam's "Ruination Flame" attack was launched.

Modinaram
It is unknown what kind of relationship they had, but much of their followers were killed by Modinaram's attack.