If you’re wondering what a “least weasel” is, they absolutely live up to the name. This is the least amount of animal you can have that can still meet the bar for “is weasel”

remind me when the boot drops

Then after that, it's behind a hidden wall underwater in a room with a bunch of boats, if i recall. Its the strongest weapon in the game, and you ALSO need to explore this secret because it contains the exclusive 'Mudman' soul.

Blusky's character limit prevents me from typing the method in full but; you first need a rush soul like Curly, Devil or Manticore. Then, go to the room with the giant waterfall with the waterwalk soul on, rush from one side of the room to the other.

yeah this room bites my ass, even WITH claimh solais on.