Your example powers are tropes and their basis in public domain
The Queen of Pain's scream is modeled after the Banshee, which had a scream that would kill... and there are LOTS of variants of Banshee. In fact, "Our Banshees Are Louder" is a trope.
Hiding in a shadow or walking through it is for example a typical feature of Ninja stories since the Edo Period, and a common Trope as "Shadow walker". That makes those two powers older than
You can not have a copyright on concepts, facts, or ideas.
Facts are not copyrightable, which was decided LONG ago over Feist v Rural. Neither can you copyright concepts or ideas. You won't get a claim on the concept of a damaging scream or turning into shadow. See also Copyright.gov (emphasis mine):
How do I protect my idea?
Copyright does not protect ideas, concepts, systems, or methods of doing something. You may express your ideas in writing or drawings and claim copyright in your description, but be aware that copyright will not protect the idea itself as revealed in your written or artistic work.