Treehouse Defense!: A Progression LitRPG Adventure

by D.K. Landtroop

From Bestselling Author D.K. Landtroop

Defend! Your! Treehouse!

Mason Baum expected sleep. He got goblins.
Summoned into a fantasy world and bound to a giant oak, Mason is handed the rare and ridiculous class of Treehouse Master. With no weapons, no training, and no way to leave, he must turn a crude treehouse into a living fortress before wave after wave of goblins tear it down.
The defenses grow. The enemies adapt. The squirrels are suspiciously organized.
Mason may have been chosen to defend it—but no one said why he was chosen.
And beneath every upgrade lies the same question: why does this tree matter so much?

Genres: Animals, Fantasy

339 pages, Kindle Edition

Published May 8, 2026

Reviews

[Jena · Rating 5 out of 5]

I adore this book! Give me combat squirrels any day.

[Samuel Merrill · Rating 4 out of 5]

The Treehouse Fort is about an extreme completionist gamer, Mason, who is summoned to a different world and linked to a tree. He is immediately thrown into a siege battle with a group of goblins. He desperately fends them off. Upon finishing the siege he is awarded XP. He uses that XP to upgrade his tree through the upgrade web. His tree grows more powerful and capable the more XP he uses and puts into upgrades. He also realizes that the squirrels living in the tree are much smarter than normal and have a society. But the goblins keep coming. He beats off several waves, but in the third the goblins were commanded by a hobgoblin. Now they have the capability of discipline and innovation. Upon meeting a scout for the nearby city he learns a bit more about his new world. The scout leaves in order to retrieve help. He beats off the fourth siege. The fifth and final siege in the first book lasts almost a day and a half and Mason desperately tries to protect the tree with the help of the squirrels. After a long and arduous siege Mason finally breaks the enemy forces, causing them to rout. As the book ends the forces brought by the scout arrive.

[bookworm594 · Rating 2 out of 5]

Just no

I almost stopped at the 20% mark. I only kept going because I hoped we would learn something about how/why he ended up there. But no. That's a next book problem. He just (barely) defeated multiple seiges-- and made contact with a single human, who promises answers just in time for the book to end. How rude.
The squirrels are great. Had the whole book been from their perspective, it might have been better.
All in all, I'm not sure why I finished this. Do not recommend.

[Alysha Joseph · Rating 5 out of 5]

Yes. Just yes.

Humorous.
Just a good book that will keep you entertained throughout.
Tower Defense with a tree as your Tower and squirrels for days.
Wear your armor properly and drink your tonics when told or you’ll find out what judgment feels like from a squirrel… or 50.

[Seraphina Daret · Rating 5 out of 5]

Brilliant, funny, and Mason's Associates are wonderful. Rodney steals the show a couple of times.

[Peter · Rating 5 out of 5]

Great book

Stellar work once again from D.K. Landtroop! Lots of action and adventure, monsters and magic. Looking forward to the next one.