Tatsu Tatsu no Mi, Model: Blizzard Dragon

The Tatsu Tatsu no Mi, Model Blizzard Dragon (竜竜のミ、モデルブリザードドラゴン)  is an extraordinary rare and powerful  Mythical Zoan type Devil Fruit that allows its user to transform into a Dragon  (specifically a Ice Dragon) at will. As a Ice Dragon the user gains the ability to manipulate the ice and blizzard and exhale a  freezing weapon called frostbreath. It was eaten by Lumi, Cook of the Storm Bringer Pirates.