Ok, anyone here play Shin Megami Tensei: If...?
In there, there is a kitsune boss, named Chefei, that is... special.
You see, he has 8 different forms, from 2 tails to 9 tails, one strongher than the other and each with different strengths, weaknesses and personalities.
Before reaching it, there are some golden chests. Some with good itens, some with them just ok... well, those golden chests have a secret:
the more of them you open, the stronger Chefei is when you finally face it.
Of course, you should have expected something like this, since this is the boss of the world of Greed.