In fact, the mechanical arm that Warlord Dean used was an indigo gear modified by Saint God Magneto. He fused part of his body with this gear, so the mechanical arm gear was stronger than common indigo gears.
It was no surprise that Warlord Dean could destroy Merlin's attacks over and over again. Even a level-ten beast like Aires was left behind.
When Warlord Dean was in a dire situation. The exit from this place was crystallized by an alphabet pattern with the power of a Saint God.
After seeing that Warlord Drune was easily killed by a Saint God-level creature, he decided to give up his life. He sacrificed his own body as Saint God Magneto's shadow figure with a mechanical arm gear as the medium.
Saint God Magneto was a brilliant Inventor Magi. He was even able to create a gear that could force an unnatural level advancement from a Warlord to a Saint God.
This masterfulness made people feel envious and scared at the same time.