There's a Dungeon in My Basement Omnibus: Books 1-3

In this engaging series, Caleb Holdstock inherits a mysterious mansion with a seemingly harmless chalk doorway in the basement that leads to a magical world. As he discovers the secrets of this other realm, his life takes on an extraordinary new dimension, filled with adventure, magic, and intriguing relationships. With the ability to travel between worlds, Caleb faces challenges that test his skills and resolve while uncovering the true potential of his newfound powers.