You have survived the more difficult task of besting Annalinnia's second sewer system nightmare without losing a single point of sanity. Hurrah to you, great work at basically being as good as a flashlight.
This is actually impressive, you've survived Annalinnia's mountain path nightmares without losing a single point of sanity. Although she begrudgingly gives you some respect for this, she believes you must have cheated somehow.
You have beaten Annalinnia's entire murder dungeon without dying a single time on the Nightmare difficulty. She didn't believe it was possible, neither does anyone else, cheater.