Kindle LitRPG Book 1-4 Free, Underworld (7 book series)

Underworld Kindle Edition by Apollos Thorne

Series: https://www.amazon.com/dp/B07H13NKTD
1-4 is free
5-6 is 0.99

1. Underworld – Level Up or Die: A LitRPG Series (Free)
https://www.amazon.com/gp/product/B076V6MBBS

2. Underworld – Through the Belly of the Beast: A LitRPG Series (Free)
https://www.amazon.com/gp/product/B07GLLWDWW

3. Underworld – Sanctuary: A LitRPG Series (Free)
https://www.amazon.com/gp/product/B07NKN4TLJ

4. Underworld – Proving Grounds: A LitRPG Series (Free)
https://www.amazon.com/gp/product/B0847BZH7D

5. Underworld – Vampire Gate: A LitRPG Series (0.99)
https://www.amazon.com/gp/product/B08BJDVRPZ

6. Underworld – Scorching Sun: A LitRPG Series (0.99)
https://www.amazon.com/gp/product/B08VNBS68L