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Start with Book 1 — Level Up or Die!
Through the Belly of the Beast is the second book of Underworld by Apollos Thorne, a progression fantasy series, published in 2018. It picks up the story begun in Level Up or Die!. Elorion's fight continues — deeper into the Underworld, stronger magic, and the uneasy bargain with his master evolving. It's available on Kindle Unlimited and as an audiobook.
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