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Well, Slow or Haste spells are very common in the guild, and Forgetfulness should at least be available in an enemy castle, or even in your own. I repeat, Light and Darkness magic is very effective only on large maps, and therefore there are enough cities, and you can find the desired spell with a high probability, and something else will definitely be available 100%. On small maps, of course, the power behind Chaos magic, even summoning, is not so relevant...