Hi, I finished the game, but there are some things that I still haven't unlocked, and I'm at a loss on how to get them.

- How do I get the Waterdragon spell? I thought that I would get it after beating the dragon, but I didn't get anything.

-I'm missing the 2nd last lewd bloom and have gotten all the rest, how do I obtain this one?

- What is the ultimate challenge? How do I access it ?

Thanks in advance.

The water dragon unlocks via an automatic conversation with Julie (at the hut by the river) after going to the moon.
There is 1 bloom per dungeon, it spawns (or not) randomly. If you are missing the 2nd to last, it's in the 2nd to last dungeon (there's also 1 on the moon).
The ultimate challenge is a challenge bloom too.