Onion King is one of the three skins released in Nomnomnom Planet event. It could be purchased in the item deal part of that event in late June 2021.
Onion King could be purchased for $4.99 in a limited time deal which included a package of 7500 coins, 600 DNA and 1200 food magnets. It was not available for individual purchase and may not be available for purchase in the future.
Details of this skin may vary depending on location, platform or time.
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Onion King - Full Size