Ermor vs Pythium Hydras, help!

[ano]

Shadow Vestals are neither poison nor cold immune so it's not an option. Skellpam + reanimated undead will work. Flanking longdead horsemen on "Hold and attack rearmost" will work best if you just want to rout them

[Viajero]

Bugger!

I had also forgotten that communion may raise the Thaums level enough to be able to cast Terror maybe?

By the way, what do you mean by Skelly spam or unending chaff? script thaumaturgs to raise undead spell in battle? each thaum only raises 1 undead... how can that be a spam?

BTW thanks for the advice so far.