After years of on-going conflict between the Mobians and the Overlanders, the Kingdom of Acorn's current Warlord, Julian Kintobor, arranged for the Overlord to fight King Max in a duel to determine the winner of the war and bring it to a quicker end. It was also a secret scheme to remove one of the main threats from power, allowing Julian's takeover to be much easier following the war's end. The Overlord and King Max battled in a sword duel, during which time one of the Overlord's body guards attempted to assassinate King Max. The assassin was stopped by Amadeus Prower, however, and the sword duel continued, ultimately ending in the Overlord's defeat. King Max spared his life to his surprise, expecting him to honor the agreement. After withdrawing from Mobotropolis, the Overlord fulfilled his end of the bargain, surrendering to the Mobian victors. After that, Charlemagne disappeared, never to be seen again.