Raven Tail

Raven Tail (レイヴンテイル Reivun Teiru 大鴉の尻尾) is a guild founded by Iwan Dreyar, the son of Fairy Tail Guild's master, Makarov. He formed it for the sole purpose of destroying Fairy Tail. It is stationed in a hollowed out mountain.

Location
Raven Tail's headquarters seem to be located in a rocky wasteland. The building seems to be part of a mountain.

Strength
Before it became a Legal Guild, Raven Tail was a powerful Dark Guild. However, unlike all the other Dark Guilds, Raven Tail worked independently, which is a testament to its great strength.

Members
The Guild's major members are unknown except for Iwan Dreyar and Gajeel Redfox. Though, five of the members appeared in the Grand Magic Games. Some names are currently unknown.