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Incubating some egg, and you'll get yourself a pet, which will help you fight in combat.

You can obtain eggs by fighting monster, sometime it's egg will drops.
You can also obtain eggs by some events or some shop

But first, before you can incubate some eggs, you need a StackItem [Egg Pass]
(To obtain Egg Pass, talk to egg seller NPC in Peacely Ville)

Then you can start incubate your egg in your home