Yes, they didn't attack. Because they didn't live to see their turn. And if they did, I wasn't particularly upset about a mass curse or plague. One lightning strike - and the Necromancer goes where he belongs :) Even a level 20 priest is much more powerful - heavenly shield or guardian angel provides quite serious protection against targeted combat magic.
Added 7 minutes later
But what can a Necromancer do one-on-one against a Barbarian??? :D
If we take it so... that both are level 20... :D
I feel sorry for the Necromancer... :D
And in general, what is the point of an army and differences in factions if there is a COOL BARBARIAN who fights only one-on-one with mages. Preferably only with the magic that does not pose a threat to the BARBARIAN.