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When you have downtime (hours or days) and XP equal to (or greater than) your current level + 7, subtract your current level +7 from your XP, increase your level by 1, and choose a new advanced move from your class. If you are The Wizard, you also get to add a new spell to your Spellbook.
Choose one of your stats and increase it by 1 (this may change your modifier). Changing your Constitution increases your maximum and current HP. Ability scores can’t go higher than 18.