Fairy Tail: 20 Hints (NaLu)

One Question, One Answer, One Guesser with Twenty Hints.

You have rules to abide by.

1. You can't ask someone for the answer or for what the hint means.
2. You only have 20 Hints. Nothing more, nothing less.
3. You cannot give up. Once this thing challenged you, you need to start now.
4. You can't get additional days to find the answer. You need to know and get it correct on the exact date and time!
5. If you are late or you do not know the answer or it was wrong, death or 3 unlucky years, you choose.
6. If you are already sure about your answer and you still have hints left, you can already report it to the said place.
7. You can waste or and use smartly all your hints. These hints are very useful.
8. You can't request for an exit for the challenge.

And the very important rule,
You need to find it out. Get the answer correct. And then report it to the Shimashima Castle. If you are right, the last stage is awaiting. You will know the reason behind all these.