You will find yourself facing a large chasm. Next to you is a purple platform with many arrows. Jump on it. The platform will constantly move in the direction you are facing and you can then use it to overcome the chasm while taking all the suspended crystals. Also, on the ledges on the sides, you can break two crates, in which you will find more crystals. There is also an extra life, which however is on a precarious platform. If you catch it, quickly turn 180 ° and get back up to the purple platform as soon as possible. Finally, enter the door at the bottom of this area.
The next part is extremely straightforward. You will simply have to continue, jumping over the lava pools and avoiding the flames that spring out. Along the way you will also find two Red Dantini, which you will have to eliminate and four chests, in which you will find other crystals. Then enter the door at the bottom to meet the boss.
Feeble will just chase you, so to avoid it just keep running in circles. When the boss stops to catch its breath, quickly turn around and hit it with the tail. Repeat the process two more times to defeat it.