Spoilers for Deltarune chapter 4
As all Deltarune fans will know, Gerson Boom is the author of the legendary book series Lord of the Hammer, that some say became so grand, it pulled the author himself into it. During his secret bossfight, he appears as a hero known as Hammer of Justice, wielding a giant greathammer.
We can parallel this greathammer to a weapon in Arcane Odyssey. I am talking about the Vindicator.
- Both are greathammers by design
- Vindicator belonged to a member of the grand navy which represents justice
- Owners of both weapons disappeared mysteriously
So here we have a member of an organization which represents justice in the War Seas, who wielded a huge greathammer, and who disappeared mysteriously without a trace.
Therefore, this is a completely undisputable theory that Gerson Boom wielded the Vindicator and served in the grand navy before being sucked into his book series.