It could be interesting.
For the Sheeda invasion I sort of felt that OL could have made a much bigger impact by having been there for the full duration of the invasion.
He could have supplied people with large amounts of ring-built weapons tech designed to help counter Sheeda invisibility and armor, mass-empowered people with Danner or potentially Garrick formulas(After vetting them/doing a background check), or actually employed his at-will recruitment authority(probably mostly this last one).
As it was he only really had the time and motivation to do the Sivana thing and participate in the final strike, more personal investment in the destruction being caused would have made him motivated to take more extreme action.
Earth sixteen also has some advantage in that they've got a series of interdimensional travel blockers.
So I guess demon earth would have to invade through space or possibly by transiting to hell sixteen first?
Which makes them a harder target for demon earth than nearly every other earth.
More importantly, it makes the dynamic different as demons try to invade as part of a long drawn-out period of global threat trying to take out all of the blockers.
Might be interesting to see how well the Congregation, the Justice League's various theurgical members, and euanthe the super dryad's ability to produce Eden wood hold up against a planetary demon invasion/invasion by demonically-enhanced league alternates.
If they're actually being smart about the invasion and fighting no-holds-barred rather than purely engaging in supervillainous fisticuffs they might open up with weapons of mass destruction as a distraction and means of splitting up League members for ambush by forcing them to try to intercept(even if hell-ruled earth produces nothing, they might be able to dig up a bunch of nukes and bioweapons from old government sites).
New thought: could Hephaestus or Vulcan replicate the theurgical metal in the Ace of Winchesters? If not, what if he had the aid of a Justice League theurgist? Might be worthwhile to try if one of them is going to Thanagar. Whichever one might end up having to fight the seven devils at some point.
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