Hectagon Crystal Necklace and the Seal Cushion

Hectagon Crystal Necklace and the Seal Cushion is a Victoria Island quest started by Arwen the Fairy.

Objectives

Offer: Hello, human! Yes, you! Please stop for a second. Have you ever heard of the Hectagon Crystal Necklace? They say one was found inside the egg of the Pigmy that lays Golden Eggs. Oh my gosh, I want it so much!
Ahhh, I've never seen a Hectagon Crystal Necklace up close before. It must be mesmerizing... hey... can you get it for me? It doesn't look good on humans anyway. You wouldn't even know what to do with it!
The Hectagon Crystal Necklace contains incredible power to stop monsters. In order to awaken it, however, you'll need Monster Erasers. Awaken its dormant power with the Monster Eraser, and it'll become a powerful necklace. Oh, and it's not compatible to humans. It only reacts to fairies. That's why you cannot harness its power... will you get it for me? I'll give you something else... an adorable Seal Cushion!
In progress: Don't just give me the Hectagon Crystal Necklace. I also want one of each: Stump Eraser, Lupin Eraser, Mushmom Eraser, Wraith Eraser, Octopus Eraser, and Slime Eraser. I mean, I'm giving you this lovely cushion. That's the least you can do!!
Completion: Oh, you are only interested in trading for it! Here it is, the Seal Cushion! Now please give me the Monster Eraser and Hectagon Crystal Necklace.