Hmmm. Well, Raelis, who is his opponent can generate essentially any amount of heat. However, his body can only stand up to 100 degrees. His armor protects him from much of his heat's damaging effects so he can have the heat around him reach up to around 150-200 degrees Fahrenheit before his armor reaches its limit and starts to heat [i]very[/i] quickly.

His sword is totally immune to heat in that it will [i]never[/i] melt and can thus reach incredible temperatures. However, after reaching 200 degrees the core of the blade starts transmitting energy to the handle, which will then start heating up and thus heat up his gauntlets. Notably his gauntlets can handle up to 1000 degrees Fahrenheit so his blade can get pretty damn hot before he has to worry.

So yeah...if I can't damage you via normal means AND I can't damage you with heat then the battle would be pretty much pointless. The only way I'd win would be by somehow restraining your character, which doesn't sound likely even with raelis being able to lift/move/throw almost 2,500 lbs (6 times his own weight with armor on) and move at 200 mph in flight or 761 mph (speed of sound) if he dives.

So the most powerful thing Raelis could probably do would be the following.

Go into the air, use Maelstrom to whip up a vortex of wind. Have already heated his blade up to 1000 degrees (F) and then mimic that heat in the vortex, then dive bomb down at his opponent and use that as an attack.