How was Hashirama in the reaper death seal in Naruto?

The Reaper Death Seal, initially created by the Uzumaki clan, is one of the few forbidden jutsus in the Naruto universe.

Hashirama Senju by Robert-Sennin on DeviantArt

Shinigami, Narutopedia

How was Hashirama Senju sealed inside the Reaper Death Seal? - Quora

How was Hashirama Senju sealed inside the Reaper Death Seal? - Quora

Naruto Sekai - I don't like Hiruzen much but he unknowingly made a huge difference here. & to all those saying Hashirama couldn't be controlled etc., it's possible he could undo the

The Legendary Shinobi That Killed Hashirama Senju - Death Of The First Hokage Revealed

How was Hashirama in the reaper death seal in Naruto?

Uchiha Madara [ うちはマダラ] — hearmylullaby-deactivated201708: 封印術・屍鬼封尽

₆⁶₆Reaper Death Seal₆⁶₆

Death of the Strongest Hokage after Naruto May be Due to Overusing One of Konoha's Greatest Jutsus - FandomWire

I can't stop obsessing over how Hashirama Senju could've met his end.. : r/ Naruto