When enchanted, P. Atk. increases by 2 for all D-grade weapons with the exception of bow, which will increase by 4. M. Atk. increases by 2 for all weapons. Starting at +4, the P. Atk. / M. Atk. bonus double. Enchanting is safe up to +3. If enchanting fails, the item will not be crystallized but the enchant value will be reset to 0.