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One reason the 'heims bless so well is free points from cold scale which can go right into pretender magic, and low resource to gold ratio on their sacreds so they can take sloth too.

For the same reason, Ermor's not an ideal bless nation because it needs to buy expensive scales. The sacred heavy cavalry will be resource limited if you take sloth, plus Ermor likes neutral temp so can't take a bunch of temperature points, leaving the points for a bless in short supply.

Niefelheim bless works differently, but all the ingredients are there: Plenty of design points and high-cost, high-quality sacred troops that don't take a lot of losses in combat.