The frog is a mysterious entity.
He asks you questions and enigmas, like what is outside the universe. He offers you candies as rewards and 5 berserk potions as his last reward.
1st question - do you really want candy?
2nd question - If A implies B and B implies C and C implies D, what does A imply?
answer: B or C
3rd question - What does everyone wish to be?
answer: a frog
4th question - If I give you one candy on day one, then two on day two, then four on day three and so on, how many candies will I give you on day 8
5th question - Now, just type the answer to that question...
answer: the answer
After you have answered all his questions he will tell you it has been a pleasure.
He is a big frog.