Board Thread:General Discussion/@comment-121.219.157.62-20150401050156/@comment-6697950-20161103063007

He didn't make the stairway. It existed there all along, but you needed to have a key for the door to access it from Alne side. Kirito and Leafa got the key after befriending Tonky and leaving Jotunheimr through the stairs after their first adventure in Jotunheimr.