Basaltic Hammer is a collaboration techniques between the crown princes. First, First Crown Prince form a hand out of the surrounding earth, then he and his brothers creates a massive hammer by combining ice, earth, and lava. It resulted in an extremely solid hammer that First Crown prince boasted to be the hardest substance on earth. Then First Crown Prince use the hand to swing the hammer. It can be assumed that this hammer is very powerful and capable of mass destruction, as Uma said that she was defeated by this technique during the last heavenly war. Also, the minotaur estimated that the hammer's force would have break Oraeguk to pieces if the hammer hit.