Oden Blades v2 are the awakened version of Odens Blade and you can get the things they require from Wano Maze in 2nd sea Teleport island v2
Obtainment: 1.) Go to the Wano Maze.
2.) Acquire Ame no Habakiri and Enma (1% for both).
3.) Offer Oden Blades V1 and swords to Tengu, a new NPC in Wano, along with 2 trillion beli, 8k sword, and 30k gems.
4.) Obtain Kozuki Clan Scroll for the mode, dropped by NPCs within the maze and Oden himself (1%).
The mode does 1.6x sword, 1.8x global damage and 2x speed.