Someone posted a thread about hidden instances in the game. This is a description on the Kappa and their love of human colons. In Nioh 2, when they grapple you, they appear
DLC Hidden Item Locations : r/Nioh
Nioh Kappa Shells Farming Method - YouTube
Nioh 2 Glory Items Guide - SegmentNext
This is the worst attack in the game. What's yours? : r/Nioh
Preview: Nioh 2 heavily improves upon while adding brand-new features