The Good Magicians Castle: At last you arrive. The Castle is magnificently enormous, and carries a aura of well preserved age. You have journeyed far to reach this point, but here you will face your greatest challenge yet. The Good Magician does not answer questions lightly, you must first pass his 3 challenges.
The first challenge seems obvious enough. The bridge is down, and a large moat surrounds the Castle. The moat is surprisingly clean and fresh. There is a door on the other side of the moat that is slightly ajar. If you could get to it, it would surely lead into the Castle. Your basic instinct tells you to not trust the moat for swimming, but the cool clean water looks refreshing, and a swim to the door sounds like a good idea. There is no apparent threat in the water.