Jackio (he prefers to be called Jack) is a High Penguin serving as a commander in the 1st Legion in the High Penguin Renement Army. He is believed to have made the Amulet of Fighters since he's a pro at sword fighting. He denys it, though, saying that it's illegal to hold a artificial amulet. However, it was later proven that he did have it but the South Pole Council aloud it due to the fact that he is a really good fighter without the amulet, so you can already see how he really fights with the amulet.