Light for the Necromancer.

The longer the game lasts, the more effective light magic is for a Necromancer. Dark magic is also more suitable for medium to long games, while Summoning is the most effective for a quick battle with an opponent, followed by Chaos. In both cases, it's good to have machines and defense. It's illogical that light magic such as blessing, stone skin, and punishing strike affects a Necromancer, but it becomes effective with a large army.