' I can confirm that dual-wielding the Onyx Lord Greatsword is absolutely possible—and incredibly fun. This colossal weapon scales with strength and intelligence, making it a beast for hybrid builds. To power-stance (dual-wield) it, you’ll need two of them, which means either starting a New Game+ or trading with another player.
The Onyx Lord Greatsword’s unique heavy attack, a gravity-powered spinning slash, becomes even more devastating when dual-wielded. The jump attacks and running L1 swings hit like a truck, especially with the right talismans boosting your damage. Just be prepared for the stamina drain; these swords are heavy, and swinging both will leave you vulnerable if you’re not careful. For fashion souls, pairing them with the Onyx Lord armor set gives you a cohesive, menacing look that screams 'boss fight.'