Dimensional Divergence

Alaric Droy, an orphan going to college studying astrophysics wakes up one day realizing there's no humans about. He searches a while before a giant attacks him, everything turns to white and he appears in a room with an elder in front of him. The elder claims to be the constellation Orion and gives Alaric a system. Read as Alaric has to survive in an unknown world filled with magic and creatures.