• Changes appearance - indoors it's a cock or a black cat, outdoors its a dragon with a fiery tail
  
• Can bring both good luck and bad luck to it's masters, but will bring stolen money.
• Can be purchased - the price is a soul.
  
• The bad news - once you have one, they're near impossible to get rid of.
• Eats omlets
• If injured, would be healed by just touching the ground

One story says that a new wife wondered by her mother-in-law's corn bin never ran out, so she took a consecrated candle and looked in the bin. There she found an Aitvaras, but the candle scared it away and it disappeared.

First mentioned when a neighbor suddenly became wealthy and the others investigated