Alloces in his false form relies on physical techniques and Earthquake hit to hit all members of the party. Having a strong physical defense works well. In his true form he uses more physical techniques like Screwdriver which does a significant amount of damage to females. In both forms having the Earth element be the active element on the field heals him. The strategy for both forms isn't too different, have a strong defense and change the field using magic.
Arakes art featured in the Imperial SaGa x Crystal of Re:Union Collaboration event