**"Joy Boy was killed in Elbaf at the hands of the previous users of the Enel and Teach fruits in the past"**

Joy Boy's death was right in front of our eyes in the Harley panel, and we didn't notice it

Loki told us in chapter 1131 that the sun died in the underworld in Elbaf, meaning Joy Boy died there.

If there was a final battle for Joy Boy, it would of course take place in the land of wars, Elbaf, especially since Elbaf is one of the (D.) as Imu mentioned

And in chapter 1179, when Imu saw Luffy and Nidhog's transformation, he said:   
"Everything was destined to happen" and decided to go to Elbaf himself

As if he's hinting that the place of the new Joy Boy's death will be the same as the place of the previous Joy Boy's death

Joy Boy's final battle was against Imu and the previous users of Teach and Enel's fruits, and his allies were the giants

And the proof that the previous user of the Enel fruit was Joy Boy's enemy in the battle is the presence of the "Maxim" ship, which only operates with the Enel fruit

But Joy Boy possesses the rubber fruit, so how does lightning affect him?

Here comes the role of the previous user of Teach's fruit. One of the abilities of the darkness fruit, as we saw with Teach, is to completely nullify the opponent's fruit ability, as he did against Luffy, Ace, and Whitebeard

Therefore, Joy Boy's killing was the result of an alliance between the users of these two fruits, but there's something additional:

The giants lost 800 years ago in Elbaf because of their children and betrayed Joy Boy, and the user of the Nidhog fruit may have surrendered after the children were threatened. This is what tipped the scales in Imu's favor and was the decisive factor in the final battle.

Final note: If the Enel fruit is inherited in "Birka" and is considered a legendary fruit, it might be a "Ruler" fruit, especially since it's connected to the Maxim ship

My theory link in X : https://x.com/riiezx/status/2080737237583396980?s=46