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I am just look for an referral egg. But it seem to be hard as there are already quite lot of Aethia post out there.

Try to reach out to your friends and share your referral link. You need only 3 signups using your referral link to get a common egg worth 0.1 ETH. That should be easy i think. Just 2 days left for this offer so you better hurry! Good luck.