Merlin's Awakening (An Untimely Error) (Volume 1)

Merlin awakens from a centuries-old spell gone awry to find himself in war-torn, German-occupied France in the midst of WWII. Before he learns much about the current age, the Germans put him to work as a researcher in their occult research facility and as a teacher of conscripted young wizards. His research uncovers the existence of a malevolent artifact hidden in the facility. At its full potential, the artifact could allow the Germans to dominate the war, assuring their victory. He also finds the staff of the facility on the edge of madness, driven there by an insidious creature of dark magic. As the SS insinuates itself into the facility, Merlin may be the only one who can resist them and destroy the dangerous artifact before it's too late to save his students, himself, and the world.