Whoops! I mean Royal Snakes. I've got 500 of them, not Thorns.
I've stopped using the Thorns altogether because they can't be resurrected. Shame, as they are potentially an outstanding unit.
I am yet to be convinced that Royal Snakes aren't among the best strike units in the game. 6-10 damage means that Holy Anger from the Inquisitors is a big help, and like I said, I was seeing 20,000 damage on a Critical (40 per snake - is that the max possible?)