1) Karna is visited by his father, the sun god Surya, who warns him that Indra will come disguised as a brahmin to ask for Karna's divine earrings and armor.
2) When Indra does come, Karna refuses to give up the items at first but knows he must due to his vow to give anything to brahmins. He asks Indra for a weapon in return.
3) Indra gives Karna a powerful spear that can defeat any one enemy, in exchange for the earrings and armor. Karna cuts off the armor without showing pain, impressing onlookers with his courage and dedication to his vows.