The battle in the spiritual world is a bit different from the real world.
Even though it's still a fight and wounds appear on the body, the two sides aren't using real weapons. Instead, it's more like various forms of spiritual attacks.
The one whose spirit first can't withstand the attack and reveals a flaw is the loser!
Just like when the Insect King attacked Uffie's mind, it unearthed memories from her childhood that she least wanted to confront, causing her defenses to break down. As a result, it took control of her body, and she is still not awake.
Apart from using embarrassing history to break defenses, another form of attack is to directly use spiritual power to strike the enemy, possibly causing hallucinations or auditory illusions.
Anyway, the approach is as mystical as possible.
"Is this wolf what Dal's inner self looks like?" After invading the spirit, the Insect King learned Dal's name.
