Taking on enormous hordes of enemies isn’t easy, so you will want to know how to level up in Hyrule Warriors: Age of Calamity. The good news is, this is pretty easy to do, and thanks to a simple feature in the game, you will never run out of ways to earn experience.
If you wish, you can dump rupees into the military training camp, which is the quickest way to level up your characters in the game. You can find it in Central Hyrule and will get access to it pretty early in the campaign. It is a simple system as you just spend rupees to get experience for a character. If you instantly want to boost a character to make your party, you can do it here. Your limit will always be set by the highest level character in your group. You can use the military training camp to bring new characters up to speed, but you cannot use it to just race ahead in levels, for those initials levels on at least one of your characters, you’ll need to play the game.
If you are low on rupees, a great way to grind experience is to simply replay levels. You can replay main missions and side quests as often as you like. You don’t need to jump through any hoops, just pick the mission you would like to replay and get stuck into the action. Remember to pick your characters wisely. You will be picking up new companions throughtout the game, so run these replayable missions with characters that need a leg up, and might be lagging behind the rest of your group.