SIVA isn’t really darkness though. So it wouldn’t work. Every subclass represents one aspect of the universe, as explained by Osiris. That includes strand and stasis being those aspects morphed into your own understanding. The third darkness subclass must be something that “transcends” basic existence, such as SIVA. Personally, I predict it will have something to do with consuming your health for damage. And of course, we need a Haemorrhage effect. (Meaning you bleed enemies and restore your own health, from that leeched hp)