[Twan]

IMO the nation is excellent, devouring population just forces it to be on the offensive all the time, and rely on thugs + chariots + indies more than the sacreds troops. But it's not a problem considering the quality of these ones. So the nation seem well suited for a medium bless good for thugs (like earth/astral 4 -or blood/nature allowing you reach high blood easily as it opens armor of twisting thorns-) and good scales (including growth 3).

Devouring pop consequences are the big thugs have to be sent to the front as soon as possible, and bloodhunting to be organized differently than with other nations, as all devour 20 pop (Kohen) or more, if you use 12 or so hunters on one province it would soon reduce populations under 6k. So for a good regular slave income you need to bloodhunt every province having sufficient pop with no more than one or two kohen with dousing rods, which mean you tax all your big provinces at about 70%, and you have more microgestion to do (carrying slaves to labs), but population reduction remain manageable with some growth.

Then, if Hinnom survive to endgame, I think it enters the totally unbalanced category, due to the monopoly on grigoris. Just think about it : since the nerf to tartarians, reliable unique SCs you can summon with blood (the only ressource you can gather in unlimited quantities, proportionnal to your number of commanders) become the most interesting, and no one is summonable by other nations without the risk of losing its price (if someone already have it). Of course there are still wished seraphs or pretender chassis to compete against them in the reliable SC category, but even if you have pearls they are far to be as cost effective - a wish for slaves give you the ressources to summon 1,4 grigori (already commander, so you also economize 20n).

Having monopoly on grigoris basically mean Hinnom can lose the race to endgame magic and still have 6 risk free first choice SCs. Or can win the race to blood magic, deny the other nations the fire devils and demon lords, and then have unlimited time to summon grigoris in addition.

I think for MP interest no endgame really good category of unique SC summon should be one nation only. It would be cool if grigoris could be linked with 3 other nations at least (as a national spell can be shared by 4 nations) so their summoning wouldn't be risk free. I think some thematic justifications shouldn't be hard to add in some existing nations backgrounds, or rival rephaim tribes should be added as new nations in a next patch.