i disagree. Cellia IS a better duelist , but has crapier dps. A duelist's ability is measured by how well he can keep a boss bussy and not necesarily be the one doing damage to it. His role is not to destroy units , but act either as a lightning rod ,or plain stop a boss. The dps part should be filled by a archer/mage/whatever ranged unit is in range. This is the reason karma is considered a cheat unit : because she can duel literally any boss in the game , for as long as her skill allows it , and not because she can do 2k damage per hit , but because she can keep the weight of the world on her shoulders during her skill usage.
In that regards , cellia is 1 of the better duelists in the game , since she has naturally high hp , decent def for a barbarian , and a skill that cuts down % damage of the enemy for her entire team , while also having MR that no other barbarian has.