Aqua Egg

A squishy lifeform filled with transparent, water-like fluid. Merging one with a water hero soul can improve its abilities via contact with the super pure fluids produced within. They're a must for adventurers seeking flexible hero souls, but good luck finding some. Due to their amphibious nature makes them hard to find, and if they sense danger, they'll quickly make themselves in a rubber ball-like shape in order to bounce far, far away.