Karol is a powerful, slow attacker with high HP and defense, capable of tanking damage and dealing massive blows. Focus on skills that boost his physical attack, defense, and HP. Essential Artes include Dragon Upper for single targets, Punishing Smash for area damage, and Nice Recovery Smash for self-healing. Equip him with heavy armor and weapons that maximize his attack power. He's a great front-line brawler.
