Nargott
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I agree that darkness is very useful to them, and often even more useful than light, but we shouldn't base our decisions on the fact that "it's very useful to them" - darkness and Life Enchantment would be great - a rain of enchanted arrows with Berserk, and that's it, game over. In this case, I am guided by the same logic as the developers of Heroes 7 (they don't have darkness in the Human guild) - there should be no magic of Malassa in the cities of Erathia; humans are zealous fanatics of the school of light, darkness is unacceptable to them, only light. The question remains with the guild - as I understand it, it won't be possible to make only a column with light magic in the guild, so we need something from summoning or chaos - darkness is contrary to the teachings of Erathia, but summoning and chaos are neutral, hence the choice between them as a second school. Of course, we can leave the possibility of upgrading darkness for humans, but it must be removed from the city (let's say, we will leave humans a chance for a secret fascination with darkness, but officially we have nothing to do with darkness :D).