[Jurri]

R'lyeh has very varied mages (with 2 full randoms!), so you don't necessarily need any magics on your pretender. They are very expensive, though, so it's only logical then to purchase good scales with your points. A no-magic wurm is nifty, since it has a high base dominion and is cheapish and powerful. Underwater, you probably should aim for a slightly more powerful dominion since sea provinces have more neighbors and thus dominion fluctuates more strongly.

You shouldn't be needing productivity, since the mainstays lobos and illithids require only negligible amounts of resources. Under Zen scales the income hit from sloth is noticeable, though.