What was the weakness of archilles?

Achilles' primary weakness was his heel, famously known as his "Achilles' heel." According to mythology, his mother, Thetis, dipped him in the River Styx to make him invulnerable, but she held him by his heel, leaving that part of his body susceptible to injury. This vulnerability ultimately led to his downfall in the Trojan War, as he was fatally wounded in the heel by an arrow shot by Paris.