I can't remember the name of this mod & I think it was removed from steam, I'm hoping to find a different site to re-install it.

I think the mod involved mostly space encounters where you would board various different ships of a custom faction whose npcs would be equipped unique weapons & armor.

They were kind of like the unbound from starforge if they had more of a black, grey, and red color palette.

The mod also added what was basically re-skin of the astrofae space monster that would guard outside the ships.

Most encounters also featured a strong boss-like npc who often wore a black skull helmet & they even had the boss health bar.