It turns out you can pump up both Chaos and Sorcery skills – isn’t that a bit much? At least, I don’t think counterspells will help much here, unless you somehow manage to eliminate the Necromancers at the beginning. Casting magic resistance spells seems pointless, at least that’s what I think. Here, you just need to have a large army, much larger than the Warlock’s, and simply wait for the Warlock to eliminate himself.

Added 2 minutes later

This secret isn’t a secret anymore – “Unholy Word” forever discourages trying to win with a small force.

But what if the Warlock’s army includes creatures that are immune to Unholy Word?:D For example, Gargoyles or Golems? Or will there be no Unholy Word at all?