Armed with a new manacaster (magic gun) based on blueprints discovered by his sister Chelle, Prince Leonidas walks the new path of unity with his brother Euden (The Prince). While his ideals remain similar to before, Leonidas comes to respect his younger brother's ability to gather the support of many allies, and pragmatically decides that the best strategy is to join him to see their goals achieved together.

Leonidas is one of the most fun adventurers in Dragalia Lost: he wields a rapid-fire manacaster which behaves like a tommy gun, allowing him to circle bosses while shooting at them with his continuous Force Strike. He fights with the support of his pactbound dragon Mars, granting him access to his power regardless of his equipped dragon. Finally, his Chain Co-ability grants the whole team shapeshift points for hitting high combo counts, a task which becomes remarkably easy with the help of his manacaster.