Swarm form is a pack of adorable, deadly kittens. Raised by goblins.
Once an inhabitant of a small elf/human village when she was a little girl. Then the village was attacked by a tribe of goblins, and Kat was lost in the confusion. Being the only living person left in the village besides the goblins, they had surprisingly decided to not kill her. Instead, the raised her as if she were a goblin, and taught her how to use their weapon of choice, the shortbow, as she aged. However, as she aged, she also started to exhibit strange powers, such as turning into a swarm of canine like cat creatures. The goblins were terrified of these powers, and recently kicked her out of the tribe. She stumbled upon insert city here and found the nearest bar.