Help with creating spells on the map!

I have a question – how do I add custom spells to a map? Firstly, how do I create them, and secondly, how do I add, for example, the effect of the "Unholy Word" spell or "Stone Skin"? I saw it in the Tribes of the East campaign, for example, in the second campaign, first mission, where Ornell was added to Ashi's legions. There, when Arantir initiated her, he said something, and an effect from Unholy Word appeared above Ornell, and then the Stone Skin effect appeared on her, and she was hit by an Ice Bolt. How do I do that? Because I know it's possible. :smile32: :smile32: :smile15: