The Soul Axe is a weapon used by Adam Lionheart, when he is in his Drago Adam state. It is an axe weapon that is transformed from Draconis' powers. The blades of the axe are shaped like a dragon's wings, with the two jewels on the front and back glowing either blue or red.

By combining the powers of Soul Calibur and Soul Edge, Adam can execute a finishing move, known as the Soul Strike, where he enlarges the Soul Axe with Draconis' powers, Krystalia's powers, and his power from others, so that he can cleave the enemy in two with great force.

Pretty neat weapon, huh? I'll be doing the Astral Magnum next.