It is a brush of the small splinter which scatters when the concrete wall, the floor, and the bedrock, etc. are destroyed. I think that I can use it for the expression such as a rampant pebble or a psychic in the battle (just like power). コンクリートの壁や床、岩盤等を破壊した時に飛び散る破片(小)のブラシです。戦闘中に乱れ飛ぶ小石や、超能力(念動力)などの表現にも使えるかと思います。