I explained before how everything being Oversized in Elbaph must be the work of something there,
The Size of Creatures there was Highlighted so many times, indicating that there should be an Explanation
Seeing how this DF is passed down through Generations, then imo it's what We are looking for,
I believe it's DF that belonged to Founder of Elbaph, meaning He created Giant Race (It's even possible his Name is Elbaph)
It's just my Guess but i believe this Legendary DF is Genetics Genetics No Mi
I also wanna remind you guys that recently when Shanks visited Elbaph, They were in a Bar that clearly referenced Foosha Village in Chapter 1, as if Oda is telling us that Elbaph gonna mirror Goa Kingdom
This means that there should be a Trio of Blood Brothers just like Luffy, Ace & Sabo.
According to Norse Mythology, Odin is Loki's Blood Brother, and this Chapter hinted that Hajrudin might be our Third Guy
Loki eating a DF means He is Elbaph's Luffy, hence why He identifies as Sun God as well,
Hajrudin could be Elbaph's Sabo, seeing how He doesn't seem to care about his Royalty,
Making Odin as Elbaph's Ace
In Goa Kingdom Flashback, Ace & Luffy ended up working for Bluejam (Main Villain) who used them to start the Fire that wd destroy entire mountain surrounding the Closed Kingdom of Goa, which matches with what Loki said that He would end the World (Basically that Fire was like a Mini-Version of Ragnarok, even Dragon said that Goa Kingdom is just an example of what would happen to the entire World)
Seeing how Elbaph Kingdom is Closed, this means that the Main Villain wants to Destroy the outside world, and He gonna use Loki & Odin to do it, in other words, Main Villain of Elbaph is an Outsider just like Bluejam, and his Goal is to burn all Four Blues
I'm 99% convinced it's that Shadow Man for multiple reasons (Representing WG).