What do the Mysterious Old Box and Magical Keepsake Box do? o3o Just curious.

Mysterious Old Box- Gives you a random MC Item for the battle when used (with exception of potions) Keepsake Box gives your pet 1-3 treasure chest slots :)

what does a bucket of polar waater do?

If you combine it with an Artificial Prism Chalice you get a Glacier Potion.

One more question. What does the Box of Wondrous Surprises do? o3o

this site is your friend and will tell you srsly.