This was notably the final episode to feature the opening theme "We Can!". Site & Safety Information
The file you're referencing, "[Witanime.com] OP EP 806 FHD.mp4," is a high-definition download for , titled "The Power of Satiety! A New Gear Fourth Form - Tankman!" . Episode Guide: One Piece 806 Download File [Witanime.com] OP EP 806 FHD.mp4
After an exhausting 11-hour battle against Charlotte Cracker, Luffy reveals a new variation of Gear Fourth called "Tankman" (Manpuku-ban or Satiety Version). This form is unique because it's achieved only after Luffy eats a massive amount of Cracker's biscuit soldiers. This was notably the final episode to feature
Cracker attempts to stab Luffy's bloated stomach, but Luffy's combined Haki and rubbery bounce-back power—known as "Cannonball"—sends Cracker flying across the island, ending the fight. "[Witanime.com] OP EP 806 FHD.mp4