So even with an imprisoned immobile pretender you still want blesses and magic paths huh? And some form of mobility, meaning cloud trapeze and teleport, so they have to have air or astral (are there other teleport spells I don't know of?)Your second pretender is IMO bad because it is in itself useless, grants you no blesses and just some good scales. And it cannot even move around to grab some thrones (immobile, and not enough magic to teleport). You are basically playing a nation without a pretender - and that's just not something one should do.
Agartha's sacreds are the 10 encumbrance Blindfighters, some trainable priest-mages, summoned Tomb Oracles, and summoned Sepulchrals. All of those except Sepulchrals would benefit from Reinvigoration, but is 3x overkill? What about taking Hard Skin (+5 Prot) instead?
I went 3 cold to combine with the chill aura - and because the points gained from 3 cold can be put into other scales, so is it any loss to my country? Blindfighters seem to be tanky but low damage, which is why I thought a Chill Aura would be nice - but should I be looking at protective blesses because of the casters?