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I'll post some pictures to make it clearer.
Something like this, but I don't think I took Vasek, and I only had single Goblins in my case; they became about 10 in each stack, in 7 groups. It's slow, and after that, there are basically no other options. I have a cloak with +3 to spell duration and a ring with +2. Maybe the ring isn't in the screenshot.
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