To defeat the Overseer, Kellen did not draw a sword. He drew a . As the final boss— Greed, the Unshuffled King —raised its twelve arms, each holding a different Debt-Wyrm, Kellen played the Mirror-Boar sideways.
If you're interested in playing "Voice of Cards: The Isle of Beasts of Burden" on your Nintendo Switch, I highly recommend checking it out. The game is available for purchase on the Nintendo eShop, and it can also be downloaded as an NSP file from various online sources. However, be sure to only download NSP files from reputable sources to ensure your safety and security. voice of cards the beasts of burden switch nsp full