Summary
Midden is an optional Queensbury boss hidden behind the Ancestral Chamber's Plasma Vial gate.
How the fight goes
The fight starts only if you choose to push through the door, so it works best as a controlled side objective rather than a surprise detour.
Attack patterns
Expect a compact arena and enough pressure to punish sloppy approach routing.
Spoils of the fight
This encounter sits behind a two-Vial door and rewards players who are comfortable spending resources for optional content.