Just saying, if Eclipse was the final Darkness subclass, I'd personally love it.

I know it was given to Bael by VI, and thus is likely a nine-related power, but that doesn't necessarily have to be the case. We know that hosting one of the Nine messes with you, forcibly shifting your perspective across time. Maybe the shift in perspective is part of what allows Eclipse to be wielded? Nobody wielded Strand before us, and we needed to change our perspective in order to use it properly. Maybe Eclipse could be similar?

Point is, glowy red energy looks badass, and I'd love to throw it at enemies. Bungie can choose how to justify it narratively.