Leveling up a Necromancer for combat is a rare and peculiar choice. Because at level-up, they receive only 2 combat skills up to level 5 (if I'm not mistaken), and then only one. And one from the Death skill tree. So, they'll suggest archery-resistance-resistance-archery-combat, and so on. The result will be a truly stellar combatant. As practice shows, according to Murphy's Law, that's exactly what happens. Something like 4233. Hence the moral: it's not worth leveling up a combatant in an advanced class (emphasize as you see fit, according to your conscience :)), first, invest in the combat skill tree (as needed), and then choose an advanced path: should he dig in graves, or think about higher pursuits?