DevoRevo
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Do they appear in the skills window? If not, then they don't work (Captain Obvious).
Just in case, I made a map where Grol is modified; he has irresistible magic and elemental sense as an example (it's not visible in the map editor, it only displays in the game).
Unfortunately, I didn't check if they are displayed because the hero had more skills and abilities than allowed, in addition to the ones listed above.