A fragment of battle power. Have toady eat it to raise your weapon parameters! Also known as Shard of ancient sword. Tips about the blueprint can be obtained from Suraia. He is at Vedan: Myna / South Myna Station Plaza. Head south from the transporter. Check on the left once you get inside the building. Once manufactured this item will be on sale at Mohandis, Rant, Kayo shops. The earliest time you can develop this item is by chapter 8.