In Chronopia Undead Risen are immune to missile weapons, and the way the rules work it could say "immune to magic". If so any/all spells would not effect them, but there is no rule that says 'immune to illusion' spells as magic is not defined in that way, though in games like D&D it is. Risen would be effected, and think of it as whatever allows them to see, that is effected.
You could potentially add Immune to Yellow Lotus magic for example, but again, it would be strange. They also have Magic Resistance, so as you can see it is either 'magic' or no, and if magic then type of spell list: Fire Lotus magic for example or Chronomagic (or whatever the firstborn spells are called)