So sometime you find a location of a Legend and it dies (or is murdered by you), but the location will still be named the same. Could the location log be updated to something like Former (name of legendary location) or something along the those lines that mark it as a deceased beings lair.

Reason being is because of the water ritual. It makes interacting with them meaningful but pointless if plan to travel there only to find out they died awhile back but you had forgotten about.