The Dark Lordling

The Dark Lordling is a non-combat pet in Diablo III, added in patch 2.7.2 as a reward for completing the Guardian chapter in Season 25.

Once summoned it picks up gold for the player.

Trivia

 * The pet is based on Diablo's appearance in Diablo I; both visually, and via his title (where "the Dark Lord" was Diablo's title in-game).