The S-01 was originally the domain of Demons, and the development of the entire world became chaotic due to their birth.
Any non-Demon individual entering this world will feel a noticeable sense of disharmony, unease, and a lack of adaptation on the Soul's Plane,
let alone attempting to provoke the lords within some of the Supreme King Domains, which is purely seeking death.
The [Deep Sea] is a typical extremely dangerous area for intruders, a "Supreme King Domain" formed by the combination of the highest level Land Deed and the territory of the supreme ones.
Just being there subjects one to various stacking restrictions, as well as the "pollution corrosion" lurking in the seawater.
The reason why Walter's broken leg couldn't be repaired over the years, accompanied by certain risks, was precisely because of the pollution invasion at the wound site.
To challenge Boss K under such circumstances is too reluctant... there might even be a risk of Death.
