The Astral Magnum is a weapon used by Sether when he is in his Drago Sether state. It is a dark red gun with gold and yellow markings on it, with a picture of Kalarios' head on two sides.

After combining the powers of Kalarios, Krystalia's and the others that are granted to him, Sether can execute a shot from the Astral Magnum where he fires Kalarios at the enemy as a beam of Astral Chaos energy after the Astral Dragon comes out of the barrel, flies around Sether and then slams into his back, charging up the finisher, before Drago Sether shoots the opponent.