There are 3 processes in the Reinforcement System: 1. Reinforcement - is the process of leveling a piece of equipment with a stone or another piece of equipment. First, attach a stone to be able to reinforce the equipment. Normal reinforcement stones attached require lv20 or higher of the same kind of equipment (lv20 helmet needed for lv20/30/40/50etc helmet) to be reinforced, while epic stones require lv50 or higher of the same kind of equipment. With regards to being upgraded to, being retained at the same level starts from upgrading to +4, degrading starts at +6, +7 onwards also have a chance of being degraded to 0, while +9 onwards stones also have a chance of being destroyed (the stone, not the equipment will be destroyed). Generally, take Lillian Arquemeece words but less 1 grade.