I'm a Defender Elite, and i've completed every mission so far on elite.
So lets have one more difficulty...
Swarmed.
Swarmed difficulty basically turns every level into a shadow lair.
Bosses stay the same, they are not in respective shadow lair form.
All statusless monsters are void.
Swarm boxes like in the final level of Spark and Roar will fly around the level.
The depth will be ???.
Basil will not be in the mission lobby, and the depth will also be ???.
Unlocked after completing 1 shadow lair.
Levels before subtowns/terminals/core are unknown passages.
Some things: