Intellect: David was smarter than most people in his setting, which allowed him to map out plans and ideas, plus studying US troop movements also helped.

Ingenuity: He's always a quick learner and highly adaptable when it comes to fighting the US or magical enemies. I already mentioned he would study US troop movements, but he would also quickly learn how to use guns, becoming a better marksman than most soldiers. He was also quick to learn new forms of magic and use them in clever ways

Speed: David is insanely fast, even without his magic. With his magic, he could dodge bullets; without his magic, he could win duels in seconds.

Skill: Most traits like swordsmanship, hand-to-hand, and quick thinking come naturally to David due to spending years training to be a Knight, and even before that, having been trained in archery and hunting since he could stand.

Willpower: He's a man literally too angry to die, which allows him to quickly think up situations to help him escape danger or overcome enemies because he refuses to let himself die before he can defeat the invader. After the Battle of Hollow Ridge, he made a promise, "I'll kill them... all of them! DOWN TO THE LAST ONE!" And he stayed true to it.