Waterfall_13
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I don't know how to change spells; I change magic. In my latest unit, the Night Executioner, it has these overpowered destructive rays and weakness spells, and the modified magic files are located in its mod in the GameMechanics/Spells folder.
The one-eyed Chaos Dwarf mage from ncf also has these spells; it seems to be fireballs and walls.
I saw this in an old NHF; there was a hero with expert Chaos magic, and all the spells in that school were modified for him. One of my acquaintances tried to make a similar hero with light magic, but it turned out that with the fourth skill level, the hero also learns a fourth perk that doesn't appear on the skill panel, so we don't make such heroes anymore.
So, did you change the entire spell? Its stats? Did it change for everyone in the game? Also for heroes?
Or did you duplicate the spell and then modify it and assign it to the creature?