Sandwiched between countless Imps. I don't want to know how many times I blew myself up here thanks to a stray Spectre.
Artillery.
Weather Forecast: Mostly Cacodemons
This entire arena is optional but felt like the final fight of the episode. And there are still two more maps.
This map is huge.
Remember when 2 Barons were a bossfight? Good times.
The real final arena.
Note the Archviles on the pyramids in the background. Can't get too close to them. I don't even have a good strategy for this. You have to press a switch to crush them on the pyramids and hope the other Archviles on the ground don't attack you. There is almost no cover.
I play Sunlust for the story.
With the exception of a few fights that are too dependent on luck (like Postcoitus Doom, which is probably a joke map) and one ugly and fairly boring arena map (Mu Cephei), I've enjoyed this very much.