Even without sun boost, Gawain took a hit from Rhonmyriado which was said to be surely lethal even if it was a light hit. He got blasted across the city and hit the outside walls, but Tristan was jealous since surviving means the people would tell more tales of Gawain's greatness. He's called the most sturdy knight.
Also without sun boost he was able to hold Passionlip for a few seconds, supposedly about as much time as it takes to blink, which is still a feat that requires equivalent to EX rank strength. He was able to do it because "My knightly virtues tell me that I must protect this innocent person, I'd even bet my soul on this" etc.
He's a knight like a lump of iron, kinda like Mordred. He's personality is fallible and he's an idiot, but he's a tough guy who tries to abide by his personal code of honor.>>160177070
No, Leo canceled the buff. Karna is just tough.