War Beast

The War Beast is a large melee attacking animal. It was added to the game in the Reaper of Souls expansion pack, and can only be found in Act Five, as well as randomly in Nephalem Rifts.

Blizzard introduced the monster with some lore as part of the Westmarch Bestiary preview in November 2013:

“Malthael’s influence taints man and beast alike. Even the dogs of Westmarch, once tame and gentle, have been transformed into wild, savage creatures. They hunt in packs through the streets, tearing apart their prey with ravenous hunger. I saw them rip a soldier limb from limb. When his screams stopped, they came for me.”

War Beast render.

War Beasts come into different flavors:

• Vicious Hounds

Vicious Hounds

Where to find them

• Westmarch Commons (only as Rare Minions)

These superunique Vicious Hounds can appear in the following areas:

1. Act V

• Phyneus the Growler, Westmarch Commons

Gallery

• 

  A Rare Minion Vicious Hound (v2.1.0)