This is the most interesting shot in the Mass Effect Universe teaser, a derelict Reaper being kept hostage by some sort of shadow company. Each Reaper is a nation unto itself, housing the genetic DNA of entire forgotten alien civilizations that were harvested per cycle. My theory back when I started my channel & did lore videos, was that the post Reaper war would see private contractors stealing & collecting DNA samples from Reapers to bring back lost civilizations, or harvesting the DNA to manufacture them into weaponized bio weapons. Imagine a horde of Rachni genetically engineered with the DNA from a Reaper housing some alien species that makes the Rachni nigh-unkillable, or a Krogan retrofitted to survive deep space, or hell creating human hybrids that could live exponentially longer than normal. Lot of ideas there to chew on, I wonder what will happen next. But this shot to me, specifically, it speaks to me.