Light Furies are related to Night Furies and are only seen in How To Train Your Dragon: The Hidden World. They can do a powerful plasma blast which will temporarily turn them invisible. Unlike Night Furies, it has been confirmed that Toothless's mate is not the last of her kind. they can interbreed with Night Furies, creating a hybrid called the Night Light. it is presumed that Light Furies can do all of the same abilities that Night Furies are capable of, but this has never been seen.