The final secret of the game, which was discovered early 2021.
To input this code you must be standing in between them.
The best way to input this code is to bring up your Equipment menu (NOT the Pause menu) and input the entire code with that screen up.
The code is as follows:
While holding [Dodge], input [switch weapons], [item menu], [switch weapons], [switch pod right], [switch pod left], [light attack], [action button], [heavy attack], [jump]
I use a Nintendo Switch controller on Steam, so the input is this:
Holding [ZR], input: [Up], [Down], [Up], [Right], [Left], [X],,[Y],[A]