M. F. is an honorary member of the Nightmarecourt, but I doubt, that he cares. He was there before. He loves to play on organisms and composes most grueling cacophonies. A mind affected by his musical ordeals is quickly rushed into the realms of the unreal and invites all kinds of monsters.
How to fight it
Ice water - and, as the last resort - medication. M.F. disables you too quickly and you will need allies within your body. Sickness Monsters and heavy psychic strain make his overture easy. But if you face him when he is entering the third act, the outcome is very unsure. If its not him, felling you, the monsters in his shadow might.gab