Lantern/Power Rings are based on this logic: To create various matters by ring(s) that exactly work like the object that thought about by the one who uses the ring. read more
Freddy Krueger is a being of pure evil and fear, he uses a person's fear, and in the Dream Realm, he is basically unstoppable, and if he were in the mortal realm, and a yellow lantern ring came to him/given to him by yellow lantern member, he would be the most powerful lantern weilder, possibly surpassing Sinestro, and holding his own against people like Hal Jordan and Kyle Raner (both green lantern versions). read more