Landing In Westeros

The Triumvirate has fallen. Only Emperor Nero remained. All the demigod forces and their allies united and crushed the new enemy, but at a loss. Percy Jackson is lost.

Percy on the other hand, finds himself in the Haunted Forest beyond the Wall. To a powerful demigod from the 21st century, with a fatal flaw made even more fatal in this harsh unforgiving world, he must survive and try to find a way back ... if a way back even exists.

Credits to the original author on ao3 :)