Asteria

Physical Description
Asteria is a female unicorn with a dark purple coat and violet hair. Her horn is badly damaged and it is implied that Princess Celestia had it removed as a punishment for dabbling in forbidden magic. She has used dark magic to remove her cutie mark, leaving a white scar in its place.

Friendship is Magic information
Asteria does not appear in canon sources.

Apocalyponies Biography
Asteria was once a student at Celestia's School for Gifted Unicorns. Though a promising student, she was expelled for using forbidden magic. It is implied that her horn was shortened as a punishment for this. Several years later, she joined the White Flank  movement. Asteria soon became the leader of a cell and promulgated a violent new agenda calling for Celestia's death. Her cell started to call itself the Sunkillers, and Asteria soon took control of all the other White Flank cells, uniting the two causes.

At protests, the original White Flanks concealed their cutie marks with chalk in order to assert a common identity. Asteria, however, devised a spell to burn the mark off of a pony's flanks permanently. The process is extremely painful, and some ponies do not survive it. Those who do are left with a white scar where their cutie mark used to be.

Eventually, Asteria gained enough popular support to march on Canterlot and brought her followers there. She claimed that they were assembling for a peaceful protest. However, Asteria was actually conspiring with Celestia's guard, Silver Shield, who agreed to betray her. When Celestia left the palace to confront Asteria, Silver Shield and others attacked her.

Character Information
Asteria is bloodthirsty, ruthless, and cruel. Though she claims to support the White Flank cause of unity and equality, she is actually just using it as a way to push her own violent agenda.

Skills and Talents
Asteria was a powerful spellcaster before her horn was damaged. She is still capable of small magic and has extensive knowledge of spells she no longer has the power to perform. She is intelligent and very manipulative.