Jakob Tanner often offers free bonus content. You can get a free copy of Arcane Kingdom Online: Dungeon Diving by signing up for his newsletter at jakobtanner.com . Security Note
You can find individual books or the Tower Climber (Books 1-5) bundle on Amazon . Download Btower Climber SeriesB01y Jakob Tanner14 zip
For reviews, reading orders, and community discussion, you can check the series page on Goodreads . Jakob Tanner often offers free bonus content