Orcs – discussion about the race.

On a large map, only the High Elves can compete with the Orcs, while the other races cannot withstand such pressure.

Also, Humans with their training will be stronger....

Usually, Necromancers level up in summoning, so we take the weakening of summoning.

I disagree; against Orcs, a Necromancer will take Darkness, not summoning, because there is simply nothing to remove the Orcs' debuffs. So, the conclusion is: either don't level up anti-magic at all, or level up anti-darkness, but even then, anti-darkness doesn't provide absolute protection against darkness... so the Necromancer won't change their mind about leveling up in summoning or somewhere else.