Increases P. Def. by 1 for A-grade armor and accessories. Starting from + 4, increases P. Def. by 3. Can be safely enchanted up to + 3. For one-piece armor, it can safely be enchanted up to + 4. HP gradually increases with each enchant level starting from + 4. If enchanting fails, the item will not be crystallized but the enchant value will be reset to 0.