User blog comment:SpookyBoogie27/Light Novel Spoilers/@comment-5917000-20130119092344/@comment-33447191-20130119102233

Well the thing is, I'm still not sure if Ryuuteimaru is the name for Skíðblaðnir(the legendary living air-ship/Flying Harem Palace) which was given to him by Surtr Second in the Extra Life of Volume 13 or a new familiar altogether.

Guess we'll just have to wait for the translations to come out.