When enchanted, P. Def. Increases by 1 for S-grade armor and accessories. Starting at +4, P. Def. increases by 3. Enchanting is safe up to +3, but one-piece body armor can be safely enchanted up to +4. If enchanting fails, the item will not be crystallized but the enchant value will be reset to 0. Starting at +4, HP increases according to the enchanting and the enchant value.