Could you provide more details about the Spells? How did you achieve such effects and/or modify the Unit's Magic? (Or is this still a theoretical project?)
The one-eyed Chaos Dwarf mage from ncf also has such spells; these were fireballs and walls, I think.
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 create 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.