Extroyer's Device is a device that Extroyer made by himself to use Steel as his second Ultra-Link, along with his own Ultra-Link. With the device, he used Steel to be more powerful. Also by turning him into Demon Extroyer, which is a very strong and monstrous transformation, a mix of all his transformations, including the ones he didn't turned into in "Driven" (Harpy Eagle, Polar Bear, and Saber-Tooth Tiger). At the end of the episode when he was defeated, the device acted like a bomb, which exploded and then he escaped. This device first appeared in Making the Grade.
- The device looked like a hook.
- The device allowed Extroyer to turn into Demon Extroyer, an ultimate and dangerous transformation.