Cassie was in the village, waiting for friends to arrive so she could play. then she saw A cub she couldn't recognize. a new arrival? His fur was black, and he seemed younger than the cubs. he also had 2 tails. His claws were white. He snuck around the village, and arrived at a building. he turned into a whisp of smoke, which moved throughout the house. it came out the other side, and reformed as a cub. he was holding many valuables (cubs have a sense where gold and jewels are, and the island has plenty of them. they like to keep them because they're shiny.) The mysterious cub chuckled, and ran off.Moe went into his home(the one raided). Moe came out of his home, and asked Cassie who took his stuff. She gave an explanation, and he froze. his fur stood on end like a cat's when it gets scared.
M:Darkchildren.
C:what?
M:we have a legend about them. If a cub dies somehow, usually from a darkchild or reaperling, and they were not good, they become darkchildren. The good ones just wash back up on shore. darkchildren make their mischief however they please. they all hail their grand leader, who looks excactly as you described. Each has black fur, but only the leader has 2 tails. he is the youngest cub on the island. The first darkchild. However the others came about, they all obey him. he knows he likes this place, and more will be coming.
Now cassie's hair stood on end.