[LDiCesare]

I tend to like Agartha EA. They can't hit an elephant in a corridor, but they have nice summons. I like the fire gnomes, earth elementals and umbrals a lot. Umbrals in particular.

MA is more mixed. I voted Arco though I play many and Pythium comes near too.

LA I like Atlantis a lot. It may not be powerful but it's easy to figure out. Death magic. Make everyone else age and die of old age. Probably not worth much in MP, though.

Marverni is definitely my worst. I played it once in a thematic MP game and it is the worst nation I ever played with. Ulm MA is weak too in the end game.

As for Lanka, I don't think it' that strong. I once tested a Kailasa vs Lanka 'Ramayana' game myself vs myself and the hyper strong demons just got banished (and otherwise killed) away by Kailasa's mage priests. I may have played it badly, but its mages and troops are probably far too expensive for an empire to produce as many mages as your opponents and the end game is not that easy because of that. Sure, they have nice summons, but it's not enough.