Onyx Roses

Onyx Roses are a pair of shotguns that were infused with the soul of fairies said to collect flowers of the same name who only blooms in Inferno by Rodin. The weapon is exclusive to Bayonetta, Jeanne's version of the weapon is called Garnet Roses. They do more damage than other guns like Scarborough Fair but have a slower firing rate and have a shorter range.

In game description
"Shotguns containing the souls of fairies known to collect the Onyx Roses that bloom only in Inferno. Each shell fired from the guns contains the curse of the fairies' trapped souls."

How to Obtain
In Bayonetta, its Golden LP that can be found in Chapter I just after defeating the Beloved in Verse 4. The alternate version, which allows Bayonetta to equip the Onyx Roses to her hands and feet simultaneously, can be bought for 69,800 halos in the Gates of Hell just after unlocking the original weapon.