Whenever Yaga captures a Denizen such as those from Rose's, Zach's, Monty's and Malachi's race, she can store them within her wool and have access to one of hee variations. Once she does, one of her horns will unwrap and turn into horns that represent the variants she can turn into at any time. The one on the top left means that she can turn into Talia/any other of the Pyeer race, the top right is Toa, the bottom left is Cassie and the bottom right is... one not often said. It is a forbidden name especially among Malachi and the Biba race alike.