Cauldron drone

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Sort of like riding the bus but less gross.

The "Cauldron drones" live in the molten seas that surround the Cauldron, a dimension hidden within Unicron. When recently abucted Transformers emerge from the Pit, the drones rise up from their fiery home and, usually after a fight, escort the abductees to the arena. Like their victims, the Cauldron drones too can transform. But while Transformers have a limited number of forms, the Cauldron drones can seemingly convert into any shape.

Some of them prefer to view silently the gladiator battles that occur within.

Fiction

Universe comic

Cauldron drones overwhelmed a group of abductees—(Silverbolt, Blackarachnia, Sideswipe, Sunstreaker, Trailbreaker, Roulette, and Shadow Striker)—and took them to the Cauldron arena. Cauldron drones were also inside, watching a battle between Smokescreen and Smokescreen. Abduction

When the captives in the Cauldron broke free, the spectator Cauldron drones were knocked aside. Escape

Notes

• Roulette claims their change forms are "innumerable." We see the Cauldron drones take on the forms of scorpions, wasps, and rhinoceroses. That's sort of innumerable.