Before I start,
here's a handy folder of a few interesting turns from my game. I'm pretty sure I've lost more total troops than most nations ever recruited.
First, I'd like to talk about my pretender.
#unfunny meme was most of the reason I did so well in that game. S9W4 is an unusual bless, but it is excellent for shadow vestals - if not the best, then one of the best in the early game for them. It diversifies you into water off the bat and, importantly, gets you S9. S9 means Rings of Sorcery and Wizardry. I was able to jump from N1 indies to Ivy Kings, Faery Queens and Queens of Elemental Air off of #unfunny meme, and from an E1-base spectre to Kings of Elemental Earth. The only paths Sceleria can't get at high levels through simple summoning this way are fire and blood. Sceleria leapfrogged from one of the lowest-diversity nations to one of the highest.
The scales were another key. Sloth is a dump scales because Sceleria doesn't rely on its living troops much regardless, and it allowed Magic 3 (and Growth 3, which is not important but is amusing late-game). Sceleria researches relatively slowly due to its mediocre researchers and the necessity of using them for summoning your army and charging into battle to spam Nether Darts and/or explode in communions. Magic 3 does lower your own undead MR, but it also lowers your opponents' MR (Nether Darts!) and means the difference between mediocre research from sheer strength of numbers/Skull Mentors and excellent research.
The metagame in the southwest was largely an unwritten Pax Agartha
It's funny you say that. The metagame in the north was like that for Sceleria, but the opposite. It seemed the motto for a lot of nations was Sceleria Delenda Est. Anyways I was at war with every nation I've ever neighbored except R'lyeh.
My early-game was dominated by the war with Ermor due to BoT. I attacked their capital, sieged it down, and lost the battle but killed Orcus and thus freed the world. Around that time I was double-teamed by Man and Vanarus. Vanarus was a featherweight, but Man managed to win their first major engagement thanks to an unfortunate bug that invalidated Arrow Fend against Flaming Arrows at the time. I'm quite confident I would have won otherwise, though I would have lost a lot of chaff. This forced me to peace out against Ermor and Vanarus to ensure I didn't overxtend myself. I won the next battle two turns later regardless, and He-Man was relegated to the dustbin of history. Man relied too heavily on Flaming Arrows for too long - it's an excellent early-midgame tactic, but it can't form the core of an army past the time battlemagic really gets going.
I was paranoid about potential attacks from R'lyeh or Bandar Log for much of the game, but R'lyeh never attacked and Bandar Log only did so after I had begun mopping up Man. I was definitely not prepared for N9B9 Gandharvas - if you only look at one of those turns, look at turn 47. N9B9 Gandharvas are not immortal, but they may as well be when you have a six-round clock before your entire army completely dissolves. That battle was a woeful combination of overetimating my own army, underestimating Bandar Log's, and shitty unit scripting - notice those vestals set to form a giant line that prevented any units behind them from actually attacking the Gandharvas before they were all dead. The war was so desperate I resorted to using gladiators and winter wolves; ultimately, I won by recruiting Ermor to force the Gandharvas and supercommunions to spread so thin they could be defeated in detail. It was a war of attrition for sure, but attrition is what Sceleria is best at. (I would be
very interested, if you're reading this Il Palazzo, in Bandar Log's account of the war.)
I was perhaps overcautious in attacking Agartha and slow to declare war on Mictlan, but I don't think it would have changed the shape of the war substantially. It was shaping up to be a slog to the finish, whoever won. As you can see, I was rushing up Thaumaturgy to turn my army on Mictlan's capital into half a dozen round 3 Arcane Dominations on that army of Magma Children as well as diversifying into blood, but I still didn't have a great answer to those N9 statues/SCs (when backed up by mage support) and had no good answer to that army underwater. Tartarians probably count for at least a little though.
After I made peace with Ermor, we were pretty much allies of convenience for the rest of the game, first against Bandar Log, and then against Agartha. I'm not sure what Ermor was getting out of that alliance by the end but it certainly helped me.
In terms of diplomacy, early on in the game I traded briefly with R'lyeh and with Vanarus. Most of my early trade was done with Agartha (!), amounting to a total of nearly 90 (!!!) earth gems sent their way. I got two hammers for 3-gem amulets of the dead though, so totally worth it. Most of my later trade was done with Ermor, once it became clear that Agartha was the rising star and not R'lyeh.
I also should have considered joining the sceleria gank, (I figured communioned banish + magic duel would have won me that easily enough) but all of my armies were literally 6 moves away and occupied, and killing sceleria while they were fighting ermor to get rid of BoT might have upset some people.
I'm not sure it would have been easy. You can see the sort of critical mass necessary to effectively deal with Sceleria's chaff - I think you could have dealt with my chaff (via giant communion), or my mages (via magic duel), but not both. Banish would have been worth little, anyways - as soon as I could (which was soon since it was an early target) I was casting Antimagic in literally every battle I could. I think Solar Rays was more effective overall for BL, and would have been for you too. I'm not sure what sort of chaff you were using at that point, either, but I'll bet it would be more vulnerable to a Longdead Horseman charge than a line of N9B9 Gandharvas. That said, an attack by R'lyeh was my nightmare for most of the game.
I ought to post some snippets from "Ignoring the octopus in the room". I think every player was in on it but R'lyeh and Ermor, and even lijacote was by the end.
Finally: I'd count how many Amulets of the Dead I had by the end of the game, but I'm afraid of what the number would be.
e: i write too much, hopefully there's some lurker somewhere who enjoys words