5 Books Found

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Based on your description:

"nightmare monsters are real and there are teams of three kids, to get rid of them. one battles the monsters, one opens portal to the nightmare dimension. protagonist can both fight and open portals"

May 13, 2026

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Likely answer

Kids’ Fantasy About Teams Fighting Nightmare Monsters

The confirmed series is Dean Lorey’s Nightmare Academy, where young Nethermancers and Guardians open portals and battle creatures from the Nightmare Division.

Confirmed match: Nightmare Academy by Dean Lorey