Hope we see a balance patch for this (and other things) soon. The non-summoner conjurations are seriously overpowered and seem to gain unbalanced stats from even a few points in summoning. Bone widow in particular is arguably the best skill in the game right now (plant and slug cost a SP - but not enough to justify their damage output).
I'm starting to wonder if you could just solo the whole game with just the bone widow skill with a modded set up. Normal stats, don't take Lone wolf or Glass cannon but take Bigger and better, don't even pick up other companions - because I think 2 in Necro and 2 Summoner, start with bone widow, If I could mod it I would start my own solo run challenge.