Black Phoenix

Overview
Black Phoenix is a dark guild, with members positioned throughout Fiore. They formed around the time of Blue Skull's demise, and their aim is to use wizard's magic against them, usually by stealing it through various methods.

Plot
The guild made Oribu Kristal join them against her will when she was around 8 - she stayed a part of it until she came to Fairy Tail at 16. She kept her affiliation with the guild secret due to fear of what the other Fairy Tail members might do to her, and also to keep them safe from attack. She eventually removed her guild-mark during a fit of rage at Nashi Dragneel's house, slicing it from her skin. When Nashi Dragneel and Takeru Khan found out she was a part of it, they went with her to defeat the guild once and for all.