Simple question really. Do Spriggans count as humanoids and therefore qualify for dead thralldom?

I think they qualify as beasts.

Bummer. Was hoping for a druid-type character, with 2 Matrons as constant bodyguards.

Interesting. I would think humanoid. I wonder if this is something that can be modified on the PC (even though I'm on the PS3). Spriggans are one of two "enemies" I don't like killing. Wisps are the other.