Alruna is a pair of whip infused with the soul of Alraune by Rodin after Bayonetta defeated her. The weapon is used by both Bayonetta and Jeanne. It is a long range weapon and can be used to grab enemies and slam them on the ground.
In game description
"A whip containing the soul of a demon who shares the same name as a flower that blooms in Inferno. Laced with thorns, it slithers as if it were alive. Those who can hear the crack of the whip can feel Alraune whisper its curse in their ears."
How to Obtain
Upon defeating the demon Alraune in order to rescue Jeanne's soul, Rodin intervenes before Bayonetta can issue her last blow. He proceeds to seal the demon inside the weapon's shell and gives them to Bayonetta shortly after. An alternate pair can be later bought at the Gates of Hell to allow use on both hands and feet.