Archsummoner, so long as the Warg doesn't go down, just eats those early spawns. If I take Path of the Cleric, any time I need to heal the warg, I go into a tactical battle, heal it, then autoresolve. That said, anything bigger than those early spawns I have to avoid until I can start summoning elementals, or get some stuff from Binding. Currently my Archsummoner is running around with an Earth Elemental, a Shadow Warg, and two Burning Wraiths (one Young). That group's strong enough to hammer -most- of the smaller groups, but anything like a Wildling Rider group, Knights of Asok, ect. are still too big for me.
Currently running fairly well through an Archsummoner go - currently season 76 with 3 cities, at top of FP with Resoln (me) at 82 compared to Kraxis at 68 and Magnar at 64... but then again, I have yet to meet any further factions than that, so it's fully possible that there are guys bigger than that.
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Edit: And there's Pariden, at 119.