Ein Abgrund

Ein Abgrund is a former assassin of Rebellion, who is currently working with Or-Gaule. She is also the sister of Yui Tatara and a member of the Abgrund Family.

Appearance
Ein has long black hair and is shown wearing a black dress. She also wears a black glove over her torn right arm.

Personality
Ein is a cold-hearted woman. She loves many kinds of flowers, especially roses that bloom by sucking blood from people. She loved such beauty that can be created from human lives and joined Rebellion for this reason.

History
At some point, Ein joined Rebellion, as she believed they would help her in achieving new levels of beauty. However, she was disappointed in Rebellion, leading her to side with Or-Gaule.

She is also part of the famous family of assassins, called Abgrund. She murdered the entire family, except for Yui, who was away in Japan, participating in the Seven Stars Sword Art Festival.

Night of Massacre
Ein, Big Baby and Naseem Al-Salem, lead by Or-Gaule, destroy the Rebellion headquarters and kill 8 of Rebellion's apostles, including Wallenstein. They are unable to find Tyrant, whose location is unknown. They then head for Cradleland, which Or-Gaule takes control of.

Kardia Urban Warfare
Ein later appears in Vermillion, in the imperial family's castle Flareverg. Ein attacks the guards and then engages Sirius Vermillion. Sirius though is unable to hit Ein and is almost killed, but he is saved when Yui Tatara appears. She has been masquerading as a maid in Vermillion. Yui reveals that Ein killed their family and that she is here for revenge. Yui and Ein then are about to begin their battle, but are most likely stopped, by Lunaeyes' declaration, that the tournament between Vermillion and Cradleland will be held.

Responsibilities as a Royalty
After the announcement, Ein is ordered by Or-Gaule, who has agreed to the tournament, to withdraw from Vermillion. Ein does this. Yui questions if Ein is running away, but Ein simply says that Yui should chase after her if she thinks she can win. Yui though lets her older sister go.

Ein, along with Or-Gaule, Naseem, Big Baby and Johann, is chosen as one of the representatives of Cradleland, for the upcoming tournament.

Abilities
Master Assassin: As a former member of the Abgrund Family, Ein has most likely been trained from childhood to become a deadly assassin. She was able to infiltrate into the capital of Vermillion, Flareverg.

Great Speed: Ein is extremely fast, as she was able to effortlessly dodge Sirius' attacks.

Plant Control: Ein's ability as a Blazer is to control different kinds of plant life. She is also able to create these plants from her body.

Device
Astarotte: Ein's Device takes the form of a seed, that is embedded in her womb. This seed is able to breed different kinds of plants.
 * Sleeping Beauty: Ein creates poisonous flowers, that can paralyze the opponent with their gasses. These gasses would be able to even paralyze an elephant with a single inhale.
 * Rose Whip: Ein creates a vine whip from her left hand. This whip is extremely fast, as if it had a mind of it's own.
 * Bloody Mary (lit. Bloodsucking Queen): Ein creates a seed, which she then throws on her opponent. This seed then plants itself in the opponent, and sprouts vines which tear the opponents flesh from the inside.

Trivia

 * "Ein" means "one" in German.