Neptun wanted to marry Loki to Pluton. The two are already talking through the Winter Snail. One lives directly under the Eve Tree. The other on the Adams Tree. Both were subjects of prophecies. With all that in mind, it is likely that the lightning that came down on the Adams Tree was summoned by Loki, who is Uranus, not by the hammer.
Why would a hammer be able to bring forth thunder? Doesn't look like high tech or a dial or a Devilfruitweapon. Many have the same misunderstanding with Fujitora's sword. They claim that the sword contains the gravity power, because Fujitora draws it when he uses his Devilfruit. Obvously a sword cannot eat a Parameciafruit. It is just a sword. Just as Ragnir ist just a big, heavy hammer.
Why would a hammer be able to bring forth thunder? Doesn't look like high tech or a dial or a Devilfruitweapon. Many have the same misunderstanding with Fujitora's sword. They claim that the sword contains the gravity power, because Fujitora draws it when he uses his Devilfruit. Obvously a sword cannot eat a Parameciafruit. It is just a sword. Just as Ragnir ist just a big, heavy hammer.