Tatsu Tatsu no Mi, Model: Bahamut/Elemental System

Class System are a set of forms the drake acquire due to some intense training in his 3 year time skip

Overview
thanks to all the training he had during his 3 year time skip and learning about Dragon Stones, drake came up with a another set of forms out side the the normal zoan devil fruit forms. just like the class system each of these forms focus on a specific unique styles of combat but instead of physical or energy based combat these forms focuses on elemental base forms by using the dragon stones as a power source. for example by using a fire dragon stone, drake can transform into a fire dragon.