The Hall Under the Hill
1) Step here to teleport to a similar looking area directly below...
2) ...then step here to teleport to a third similar looking area...
3) ...then enter the mound from the north end to meet the Faerie King
4) Press the button to make the lift descend; press the up button at the bottom to return to the entrance
5) One of the Queen Dragonflies has the Faerie Key
6) Click on hidden doors to reveal treasure
7) Click on tile to reveal key hole; use the Faerie Key to open the passage