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The Osten set of moths was only available during a limited-time Firefly Event, from 24th November – 3rd December 2016 by normal breeding.
As the event is now over, its moths can only be bought through the Special Visitor for , or – if you have at least one individual of one of the moths – by laying eggs for glowbucks, or using a Decoration's Special Ability to lay an egg for free.
Osten flowers can be obtained by feeding Trevor purple event treats during its Firefly Event.
For hatching and raising every moth of the Osten set to adult at least once, you'll be rewarded with the Butternut Squash Blossom Decoration with the ability to Hurry a Caterpillar every 24 hours. For perfecting it, you'll get the Deluxe Butternut Squash Blossom Decoration with the ability to Hurry a Chrysalis every 3 days.
For perfecting the Osten set within the event timeline, the special and limited Exclusive Butternut Squash Blossom Decoration was awarded with the ability to Hurry an Egg every 3 days.
- "Osten" means "Four" in Muscogee.