Part of the Assassins Guild, whose members all have bounties on their heads. Members of this guild are all born with a condition affecting their mana, known as “The Blighted”, and in Ren's case she is able to secrete poison through her skin, earning her the name "Ren the Poison Moth." Normally wears heavy clothing, and when her skin is exposed she is capable of spreading poison around an area. A bit of a tomboy, who has a shy personality thanks to her power.
(Source: I Was Reincarnated as the 7th Prince so I Can Take My Time Perfecting My Magical Ability Official Site)
