Undine

Undine is a set of elemental launchers created from Rodin by infusing them with the soul of Undine. The Undine set use the extreme feelings of Undine to create flames from her jealousy and ice from their lament, which explain their fire and ice elements. The weapon is exclusive to Bayonetta, Jeanne's version of the weapon is called Rusalka. It is a weapon made to inflict lasting damage to enemies with their flames and freeze them in ice.

In game destruction
"Two flamethrowers containing the soul of Undine, who threw herself into the Coctycus river after a failed relationship.

Undine's extreme feelings of jealousy burst into searing flame, reducing her enemies to ash. Her breath of lament freezes all who are hit by it dead in their tracks."

How to Obtain
In Bayonetta 2, the Golden LP for the weapon is broken into 2 pieces. The first one is found in verse 1 of chapter VI after the battle against the Fidelity. The second one is found in the ruble found just after the cutscene with Loki and the Masked Lumen. The alternative set can be purchased at the Gates of Hell for 49800 Halos.

Trivia

 * The name Undine is derived from the name given to a type of water elementals in the alchemical works of Paracelsus.