Oh, I just abuse Rulwe on Dicktacles of Growth that you can find in lesbo mom-daughter house in Slinsk.
Lo and behold - Rulwe, the Murderfucker of Worlds:
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I still haven't got to Novos, but he already deals 600 damage with Warrior's Mark that turns his attack into line-AoE. He one-shots everything. Even bosses. Evem DoT effects fail to deal with him.
He can't be reasoned with, he can't be bargained with, he doesn't feel fear, or remorse, or shame. And he absolutely will not stop, ever, until he fucks everything.
...and per version 6.1 Dicktacles seem to not work. So I stick to 6.0A to grow him stronger still and switch saves to 6.1 when I encounter an unpassable bug.