Board Thread:General Discussion/@comment-4519633-20141022032431/@comment-3398493-20160529094549

We don't know who of the gods or which supreme being gave the HG. It could be the strongest god of all. Also, DO Dagger/Excalibur have the power to kill all kinds of immortals. Hades didn't try to comfront Rumple with the Dagger... Only through a Deal.

Both the Olymbian Crystal and Excalibur/Dagger can kill immortals but they function in other ways.