|Kavacha and Kundala|
|Lancer | Launcher|
|Title:||O Sun, Become Armor|
|Owner:|| Lancer of Red|
Kavacha and Kundala: O Sun, Become Armor (日輪よ、具足となれ, Nichirin yo, Gusoku to nare (Kavaacha & Kundaara)?) is the golden armor and earring given to Karna by his mother, Kunti. She felt fear in becoming an unmarried mother and prayed to Surya to protect her son, granting him a powerful defensive-type Noble Phantasm integrated with his body that emits the radiance of the sun itself. Due to being light itself taken shape, it is difficult for even the gods to destroy. It is as thick as it looks, an invincible armor that protects against all harm, physical or conceptual. As long as it is active, all damage inflicted on Karna will be reduced to a tenth of its original value.
Due to its toughness, Indra attempted to nullify it by transforming into a Brahman priest and visiting Karna's mansion. Indra asked him to hand over his personal effects upon going to bathe, and although he knew of Indra's trap, he swore that he would not refuse a Brahman's requests, giving up the armor that was the only sign of his birth. Karna's posture was much too noble during the event, so Indra thought that it had to be rewarded, granting him the spear Vasavi Shakti. He still possesses the armor as a Heroic Spirit even though it was stolen in the myth, and utilizing Vasavi Shakti requires the armor to be permanently sacrificed.
The armor differs slightly between the two incarnations of Karna. Within the Moon Cell, it is able to protect against being deleted, allowing a human that has it to return to their body after the Moon Cell Holy Grail War even if they are not the winner.