Ryuuteimaru bears resemblance to a toy boat which will eventually grow larger in size along with its master's growth.
It is one of the legendary Skíðblaðnir ships that were created by the tribe called Ívaldi who also created Thor's Mjölnir. Supposedly, very few of these ships were created.
In the Volume 13 Extra Life "The Worries of the Next-Next Heir" (which takes place after Volume 12), Issei is given a familiar, the living Norse flying ship Skíðblaðnir, by Surtr Second. Although it is only the size of a toy boat, according to MacGregor Mathers, it will continue to grow and evolve into different forms by using the aura and imagination of its master as its source. Second also jokes that if Issei is going to become a "Harem King", he would need a harem palace. With Issei as its master, it is highly possible for it to actually grow into a flying harem palace.
It was briefly mentioned by Issei when he was discussing about familiars with Asia. He states that he made a master and servant relationship with his familiar, Skíðblaðnir, which shows some compatability between the two. Issei later officially names it Ryuuteimaru in Volume 14.
Powers & AbilitiesEdit
While it initally appears to be a small ship (starting at the size of a toy boat), it will continue to grow and evolve into different forms by using the aura and imagination of its master as its source. Despite its small size, it can still fly while carrying its master.
- When Ryuuteimaru was given to Issei, it was stated that it could potentially evolve into its own dimensional plane.