This Leprechaun King's chamber. He and his Leprechaun foke will disappear one after an other when you enter this room. If you used the four leaf clover, they will leave in fear/respect. If you played the fiddle for them, they will all be dancing and one by one, disappear.

The big difference is, if you use the fiddle in the room before, the Leprechaun King will leave his scepter. It isn't useful, but does give you extra points.

Once the Leprechauns have all made their exit, the Magic Shield is yours and your quest is nearly complete.