The Ancient Weapons “Secrets and Purpose” | One Piece Finale Theory pt. 2 | Ch. 1011+ [Spoilers]

What could the secret behind the ancient weapons be? We are only aware of a handful of details relating to each weapon. The rest of the details are shrouded in mystery. What was their original purpose?

Be sure to watch this video first: https://www.youtube.com/watch?v=312cy0_eV4U

My original theory relating to this topic: https://www.youtube.com/watch?v=227lqQBkQWc

Songs:
The House in Fata Morgana Ciao Carina
Umineko Discolor
Thronebreaker gernichora theme
Umineko lastend conductor

My Twitter: https://twitter.com/OneWorldHD​

Comment if you think I’m right/wrong, and try to improvise! Constructive criticism is always welcome.