This egg is only available in Egg Cave's Cash Shop Park.
Contrary the popular belief, the stalagmites beneath the Arnmnae egg are a part of the egg structure itself. Causing damage to the stalagmites causes serious internal damage to the egg.
Interestingly enough, Arnmnae eggs are composed of ancient molecular and chemical structures that have only ever been found in the cold, southeastern waters of Ark.
Arnmnae are an ancient creature that have lived in the seas for ages. It's a wonder that Arnmnae were not discovered sooner than they were. Arnmnae themselves have an advanced subculture of traditions, architectural style for building underwater, and even their own music (that consists of many monosyllabic roars). The Arnmnae have close allies in the humanoid Seamer mermaid-like people of the southeastern waters of Ark and it is suspected that their longstanding friendship has allowed both groups to survive for centuries.