Titan
Possessing multiple useful Soultraits would make it much easier to fight opponents of a higher weight-class. It was even better if the foes didn't possess useful Soultraits, or if they were natives who didn't own Soultraits, in the first place.
That was currently the case. The Untamed Awakened had multiple useful Soultraits that could be combined, further enhancing their might, whereas the Awakened of the Zentika Empire had only one somewhat useful Soultraits. Some weren't even blessed with half-decent Soultraits.
The Berserkers and Warlock Centaurs didn't seem fazed by the Lionhearts' fire, and their great physical prowess granted them certain benefits that couldn't be neglected either.