Rhoaton is one of the Ten Weaponsmasters of Jade, Rhoaton is a skilled fighter, but his primary ability is advanced chi manipulation. He was orphaned as a baby, and raised by the Shadow Elves as a "gopher", but eventually trained as their champion. The Shadow Elves are the oldest race on Jade, and keepers of it's darkest secrets. It's possible that Rhoaton is skilled enough to defeat Julia, but when they fought in the Tournament of Arms, Rhoaton's chi was rendered inert by the arena's magic nullifying properties, and Julia was able to win by a narrow margin.
He is also one of Ancient Gina's underlings and, along with Master Ecko, is currently helping her keep Dreadwing in check so that he doesn't harm anyone while helping the construction of the Infinity Engine.