The Strongest Sage with the Weakest Crest 25

ONE BOY WILL STOP AT NOTHING TO BE THE WORLD'S STRONGEST…NOT EVEN BOARDING AN EXPLOSIVE SHIP! Matty's plan to craft a new weapon using a transcendent crystal has come to a standstill due to a lack of materials capable of withstanding the crystal's power. The only solution is to acquire a rare metal that may possess qualities compatible with the crystal. Unfortunately, this rare metal can only be found in a dangerous zone at sea where flight magic doesn't work. Matty and his friends decide to set sail for dangerous waters in an experimental ship that has a habit of blowing up!

Volume 25 of The Strongest Sage with the Weakest Crest manga series by Shinkoshoto.