Typical Sheeda, really. Repurposing something that already exists. and since this is DC, that cavern could be the size of a city.
Crud, the whole region is riddled with Sheeda tunnels, isn't it?

They could come up like anthills
everywhere. No wonder the others are running around putting out brush fires.
Great, more dealing with ol' Swirly-cheeks' false joviality.
Objective in sight. But don't forget about the defences.
Because
of course Melmoth can recognise an Apokaliptian. Guess that Father Box is playing nice for him then.
Gods, will someone shut him up please? Dude is tailor-made to get on people's nerves, isn't he?
Time for some rip-'n'-tear action on the pixies. Remember, kill the mobs,
then go looting.
Something like baby plasma constructs? Miniature versions of the living sun The Renegade fought?
No time for chit-chat, Canis. Get your DPS butt in gear. And good to see there are still things that can surprise OL...

...Well, that's not good. Weapons tailored for anti-Lantern work?
...Arm gone? Ouch. Howsabout you don't pull that tanking shit again, OL? I rather doubt you can take
too much of that.
-Try to survive. Seriously, this is bad tactical thinking. Bearding the enemy in their own lair, on ground of their preparation. No wonder they're kicking your arse. I thought you were listening during the Team's lectures, OL?
Thankfully, OL still has his rings buried inside his chest and brain, doesn't he? Good thing, methinks. Might want to make that a more
permanent option.
Oh, that's just bullshit. It's not even phasing, much less vaporous.
You know it, pointy-ears.

I'm going to enjoy seeing your immortal ass get kicked
repeatedly.
So, they die upon exploding. Just hope you can keep tossing steel plates at them, then.
Crap, you pulled too much aggro. Dammit, OL!
'So well'? Just a matter of time, pinky.
At least Swirly-cheeks has been shut up (Thank you, Canis!) And now we get to see some accelerated thinking.
Bubble-shield from hell, baby. Now that is how you tank an army of glob-goblins...
Oof. Yay for Lantern adaptability. That's one hell of a mess.
Ah, good, he's intact.
Mostly, I assume.
He'd probably take one look, shrug dismissively and order them squashed like the bugs they are. Sheeda are petty, sadistic and small-minded, at their core. I doubt He would find anything noteworthy about them.
Eh, worst case, the named nobility would escape
somehow and turn up on Earth, because Fifth World. At
extreme worst, you get Final Crisis.
And splitting the party further. Goddammit, OL...