Irene Belserion

Irene Belserion is one of villains of fairy tail as well Erza Scarlett

About
Irene become follower of Zeref where she learn magic to become a witch. sometime she gave birth to a daughter named Erza only sent to Rosemary town when Erza enjoyed normal life before she was kidnapped as slave for Zeref's awakening and later she become Fairy Tail.

upcoming war between Ishgar and the Alvarez Empire which lead gulids include Fairy Tail lead resistance against the empire. Irene sent her swords Heine Lunasea and Juliet Sun to become spies to Blue Pegasus. Irene located Acnologia whose main object to kill the dragon slayers for  fuflil power and give him a worthy challenge