You will start this level in a dark area with limited visibility. Proceed and eliminate the Red Dantini that you will encounter. Jump on the crumbling platform to reach another block of ice, on which you will find a chest containing crystals. The path is very linear and repetitive. Keep jumping from one block of ice to another using the collapsing platforms. Along the way you will find many crates containing crystals and some Ice Dantini: take them out quickly before they can hit you with the stalactites. Just before the end, there are a couple of slightly more challenging jumps to perform. Then enter the door at the end.
Smash the two crates in front of you to get more crystals and then jump to the double-arrow platform on the frozen pool. Use the platform to go through the long tunnel. If the flying Dantinis get close to you, take them out with a swipe of the tail. At the bottom, you can smash two more crates to get more crystals. Then enter the door to face the boss.
The battle takes place on a very slippery ice sheet, so you'll have to move carefully. The demon Itsy will come towards you walking slowly. When it staggers, quickly hit it with a tail swipe or a stomp attack. The boss will split in two. You will have to do the same thing with the two halves as well, but they will move faster. It is advisable to always keep the camera oriented, so as not to get hit. When you hit them, the two half-bosses will split in turn into two smaller parts, which will do somersaults and which you can eliminate directly, stomping them or hitting them with the tail. When you have eliminated them all, you will have won the battle.