Hello! I've finnished the game but still dont know where to find the ''leaders reward'' scene, also its ben sutch a long time i forgot what ''Swords key'' was for or even who Sword was lol
You need to finish each repeatable Quest Guild quest in Piratetown at least once (all nine of them, you'll need the golden badge for the 3-star quests). Then Buba will ask you to talk to Vulfox in the guild lounge. You can check the walkthrough for more details. Sword is the leader of the royal knights you met in Safen at the beginning of the game. So far, there's no use for the key yet, both in the public and the Patreon version.