Modder group Datehacks have created a Dark Souls 3 mod that allows you to play as the bosses.
Sharing the details on Reddit (via Kotaku), the creators stated that the "Forces of Annihilation" mod permits players to experience the game as "any enemy/boss anywhere [across the] WHOLE map", complete with their HP and weapons.
Datehacks was also behind a similar mod for Dark Souls, but because "no one plays [Dark Souls 1 Prepare to Die Edition] at all" apparently, they hope the Dark Souls 3 mod - which has been in development for three years - will gain more traction.
It's not recommended you try it online, though.
"As he mentions in the video this mod is literally impossible to use online so don't bother," a commenter emphasised on the YouTube channel. "You will see everything still happening but any other player will still see the normal game. You can't attack them with your possessed or swapped enemy, they can't see it.
"So again don't bother using online unless you want to just get a quick swift ban."
As yet the mod does not have a final release date, but the developer wants "to release a version as soon as possible to be honest", and responded to a Reddit comment teasing there might be more information revealed next week.