Take Charmed Kingdom Inhabitant 9/15 and the HORN (K).
Take the HELMET (L).
Walk forward to the Sewers.
Take the PIPE (M).
Put the HORN in the water (N) to get a HORN WITH WATER.
Put the SNAKE on the puzzle for a mini-game.
Use the snakes to rotate the rings and restore the image.
Solution: O, Px3, Qx2, Rx2.
Take the FANG (S).
Put the FANG on the bear and take the Plant Spell (T).
Put the PIPE on the puzzle for a mini-game (U).