Demon Colossus

The Demon Colossus (魔王の守護巨像) was a golem made to be a Floor Guardian in the Dungeon, then given to Gadra to tinker with. It was destroyed in battle with Gozaline and in the end was used by Ciel as an incarnation medium for Gadra, evolving him into a Metal Daemon.

Characteristics
The Demon Colossus, being a more advanced iteration of the Elemental Colossus, naturally shares many of the same qualities. It's a massive humanoid figure made of Magisteel but has been made even lighter than the previous version. Unlike the Elemental Colossus it is not autonomous. It has a cavity in its torso dedicated to being a cockpit and is able to be controlled by a pilot or controlled remotely. Its armor is multi-layered, with a Charybdis Scale infused layer giving the entire thing the properties of Magic Jamming. It was also imbued with a self-destruct function that is capable of completely destroying it and anything in its surroundings. Not only is it physically capable and strong with magic, it is also capable of more scientific attacks such as its Purple Thunder (パープルサンダーッ) which fires out electricity at over a million volts. Its special attack is called Demonic Buster (悪魔的破壊砲) and condenses not only the magicules of the golem and its pilot but those in the surroundings to unleash a devastating ray of dense energy.