brovach
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As a minor addition to the reference guide: some spells that have opposite effects, when cast on top of each other, will only leave the effect of the last spell and remove the effect of the previous one (when casting slow on a unit with haste, only slow will remain).
This works for the following pairs: haste/slow, blessing/curse. It does not work for: joy/sadness, luck/misfortune.
By the way, regarding misfortune. Despite the factors that lower luck, such as visiting a looted pyramid or casting the misfortune spell, luck never drops below zero in battle (or rather, the luck factors show "-2" for the spell, for example, but in reality, luck never goes below zero during the battle).
This works for the following pairs: haste/slow, blessing/curse. It does not work for: joy/sadness, luck/misfortune.
By the way, regarding misfortune. Despite the factors that lower luck, such as visiting a looted pyramid or casting the misfortune spell, luck never drops below zero in battle (or rather, the luck factors show "-2" for the spell, for example, but in reality, luck never goes below zero during the battle).