So I noticed, with all the trolls and humans on their way to the new session, every element/power/attribute/whatever is covered, with the exception of Sollux's "Doom".
All the trolls with repeating titles died, except Aradia, who stayed at the green sun anyway, and all the trolls with an attribute not covered by a human lived (Except Sollux isn't coming... yet? So far? There's still 3 years to go.)