Surprise attack
Sticky. That's what everyone felt like at the moment. Their clothes were damp from sweat, but at the same time they were also covered in dry sweat. A fine layer of salt covered their skin.
Nero was the only exception to this rule, mainly because every time he used his flames his body's temperature would automatically regulate itself. Even when he wasn't actively using his ability, keeping his aetheric pressure high somehow kept his body cool enough to avoid being drenched - though he did still sweat from time to time.
But more than anything else, it was just because he was used to such exertion, and more. Although hiking through a forest filled with dangerous and deadly threats was a tough gauntlet, somehow old Footer had managed to exhaust him even more.
So while everyone else was ready to give up for the day, he was still ready to continue on, despite doing much more work than everyone else.