Play through the level until you reach the broken water wheel you passed earlier in the game. Now hold
to activate the Amulet of Uroborus. Heal the water wheel until the camera slows down. Now release
The broken pieces will hover in mid air. Pull the lever on ground level all the way back. Aim the Amulet of Uroborus at the wheel again before the lever starts to move. Decay this time until the piece that looks like a T blocks the lever.
Now use the debris to get on the blue platform on the right side of the wheel. Once you're standing on said platform activate the Amulet of Uroborus and heal the wheel until it's complete. The platform you're standing on will now be on top. All that's left to do is to jump on the ledge, use the Amulet of Uroborus on the gap you're facing now and that's it.
You have repaired the Water Wheel of Kirra.