Flesh Beast

Flesh Beasts are the weakest of the Vile Children, spawned by Flesh Spawners.

In-game
Flesh Beasts are encountered during the Dark Wanderer's brief cameo at the start of Act III, just outside the Kurast Docks. Although they might present a bit of a challenge at that point, by the time they become commonplace enemies in Act IV, the only dangerous things about them are their numbers and their parents.

In Act IV they can spawn from Flesh Spawners in Outer Steppes and Plains of Despair.