The tome of knowledge from the Requiem for a brain quest spawns 2 extra groups of Margonites back where Alem spawns, when you pick it up, for a total of 30 without the shrine group.
As for speed tips, 12 minutes isn't bad.
If you're good under pressure, you can free the bosses without killing any of the moniliths, that shaves off a bit of time. :]
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