Rex tightened his grip on his spear, the weapon's shaft warm beneath his fingers as black-golden flames roared to life around it.
He didn't have imbuement arts for imbuing his spear. Imbuement Arts were skills which could enhance and amplify the user's weapon with the mana and element of the user. As for his method, it was simply wrapping his weapon in his own element to strengthen its cutting edge and destructive power, not comparable to imbuement arts but it was only what he had.
Rex had read more books he had obtained from the gacha and knew that what body refiners train were martial arts and imbuement arts were a staple of it. Not to be mistaken with enhancement arts and main arts, imbuement arts could be called a branch from the main art as well as similar to the enhancement art. If the enhancement art helped users strengthen specific parts of their main arts, the imbuement arts strengthened the weapon of the user.