I'm stuck on this aquatic spirit

Answer from: BeenThrewOnce
Have you done all of the available quests for Milady? If you haven't, you can probably get more powerful spirits. If you have, make sure you have three of your most powerful spirits with you. I like to have three different types. Humanoid works best against aquatic. Then put another spirit like a terrestrial spirit next to the humanoid. Even though it's weak against aquatic, putting it next to the humanoid will give it a boost. If that's still not enough, use your last spirit and all the gems that you've gathered in the dungeon. If it doesn't work, sorry! You could go to defeated labyrinths to train up your spirits. Collecting the gems is a good idea. They give you experience at the end of the labyrinth if they aren't dead, though you probably knew that.