I just played through the Void Sanction story arc.
Here’s the wiki summary:
Void Sanction
TL;DR: It’s split into 7 parts, with 11 door missions (several of which involves defeating elite bosses).
And my reward was … 6 reward merits? I was expecting 15-20 merits. I think this is something that might need to be looked at and adjusted, rewards-wise.