Arms is a third grade dragon from the Lance Plane. He was lured into attacking the Goblin Plane by Gazlowe, who intended to use the dragons to power his space furness for Project Immortality. However at the last moment, the furnnes was blown up and as a result Arms was left in a dire situation. It was in his weakened state that he was found by Greem who managed to get him into an Assistance Contract. Where in exchange for providing protection and making Zacha the slave of Greem, he would get 100,000 crystals per fight, his freedom and the dragon crystal of the green dragons.
He would then assist Greem in gaining his foothold on the Lance Plane and in Garan. As a result of his endeavours in Garan, he needed assistance to transport 11 dragons back to Lance and thus sought out Greem, only to have Alice try and make him officially join the Crimson Family.