[atul]

Depending upon the research levels, a group of Sentinels can keep W9F9 blessed Vans put for several turns while indy archers and Golem Crafters casting Magma Bolt deal with the damage part (Ench4/Evo3, Attentive Statues (Ench3) might also work). I don't know how well that would work in the field or how cost-effective it'd be, but at least you can make Vanheim player regret ever storming your castle.