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Pick your hero, then for each skill set the current level and your target level. The calculator totals up all the Books of Knowledge and Skill XP you'll need.

Books of Knowledge are used to learn and level up hero skills. Different skills cost different amounts, so the calculator works it all out for you.

Skill XP fills the progress bar for each individual skill. You need enough Skill XP plus Books of Knowledge to upgrade to the next level.

You can calculate one hero at a time. Use the hero selector at the top to switch between heroes.

Yes! Your skill levels are saved in your browser so you can pick up where you left off.