I don't think people build a knight to tank gwurms; they build to tank the best they are likely to be called upon to tank, and accept that doing so may result in small losses of efficiency elsewhere.
Note I don't mention gwurms or pillars as an obscure side line activity; they are the two non XP activities that I'm likely to be invited to or decide to organise.
@raev you mention sacrificing hp/AC might increase downtime, but there is almost a level synergy there: Wightknight's philosophy requires more medtime to get back to full mana anyway
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