The Guild Codex: Demonized4 books in series
Taming Demons for Beginners Publisher's Summary
Rule one: Don't look at the demon.
When I arrived at my uncle's house, I expected my relatives to be like me - outcast sorcerers who don't practice magic. I was right about the sorcery, but wrong about everything else.
Rule two: Don't listen to the demon.
My uncle chose a far deadlier power. He calls creatures of darkness into our world, binds them into service contracts, and sells them to the highest bidder. And I'm supposed to act like I don't know how illegal and dangerous it is.
Rule three: Don't talk to the demon.
All I had to do was keep my nose out of it. Pretend I didn't find the summoning circle in the basement. Pretend I didn't notice the shadowy being trapped inside it. Pretend I didn't break the rules. But I did, and now it's too late.
Make sure to check out the companion series, The Guild Codex: Spellbound, available now, and The Guild Codex: Warped, coauthored by Rob Jacobsen.