Well, Wither assumes that you're going to allow enemy to rampage through your lands (-healing, -xp). If you have to do that after archmage tech then you did something terribly wrong in your game. There are better alternatives to it's stack damage that doesn't require a national unit slot, the same could be said about it's pitiful -10% strength debuff.
Having anti-vitalize as a tier 2 spell would be nice, would give some more time to create some wastelands before everything is settled.
Having anti-vitalize as a tier 2 spell would be nice, would give some more time to create some wastelands before everything is settled.