My Best Friend is an Eldritch Horror Books in Order

Aspiring mage Damien Vale accidentally binds himself to an ancient entity that could destroy the world. At Blackmist College, he must master magic and conceal his companion's identity while surviving teachers and enemies who threaten his ordinary ambitions.

Back at Blackmist, Damien carries powerful traces of the Void and unanswered questions about its purpose. When a friend disappears at another mage college, he sets out to intervene as ancient forces tighten their hold on the world.

Damien's uneasy alliance with the Void offers hope against the Corruption, but Blackmist's approaching tournament brings unwelcome attention. As he and Sylph try to hide their growing powers, an arrival carrying a dangerous secret threatens their fragile stability.

Damien begins to settle into Blackmist with Sylph and Henry beside him, but forces within the Void are stirring. As he learns more about the world's repeating cycles, protecting it becomes harder than simply defeating an enemy.

Summer promises Damien and Sylph a break from competition, but ancient enemies continue to maneuver around them. With an ally missing and new threats arriving at Blackmist, Damien must balance school life against a conflict growing beyond his control.

The Corruption advances while the nobles remain divided, leaving Damien and Henry to defend everything they value. To preserve the Mortal Plane, they must confront Second and attempt a victory that even the Void's combined powers could not achieve.