What skills should Necromancers take when facing Orcs on a very large map?

We started playing last night, so I didn't have time to reply. So, regarding education, I'll add it later; read more carefully, Ganseng. +9 defense from stone skin doesn't make much difference, especially for undead, which already have a low defense. Besides, if a hero has around 30+ magic skill and 9-10 defense, skeletons can shield allies, like liches. Also, I'll have Readiness and Immovable skills, so they won't be taken down quickly. And finally, they have a chance to stun an enemy on attack, which is very useful against the orc's Frenzy, or at least they can be used to push goblins away. The chance of Luck dropping is 2%, exactly the same as Magic Light. So why does everyone recommend Luck if the probability is the same? By the way, we just finished playing up to level 15, and I've been offered leadership 2 or 3 times already!:confused: But no one has offered Magic Light or Luck yet, and I still have one slot left. By the way, Soldier's Luck works on Vampire Princes.