[Taqwus]

The freespawn masses do let you wage a war of attrition. While without backup from real troops, they'll die in droves (archer-heavy nations in particular can carve them up -- if you're fighting Jomon samurai with just dreamers and madmen, you can expect heavy losses due to large differences in equipment and training...), but there will be replacements.

Blade wind would also be ugly, methinks. But massed archers are an obvious weakness.

Be careful not to let your freespawn starve your illithids into disease. The supply allocation routines are non-deterministic, if memory serves.