The Black Dagger had done that, obviously; it had cut away the illusion spell.
Wiz used an illusion spell to fill the meadow with duplicates of himself.
It must have been the results of an illusion spell rather than an exhibitionist crazy homeless guy or a real enchanted frog prince.
Apparently the illusion spells had held up because Dorothea gently suggested that she lie down for a while and rest.
Her astral senses were becoming so tuned that she could pierce an illusion spell almost automatically.
He gave a dice to Boris that can cast illusion spells.
"What if I put an illusion spell on everybody to change their accents and make myself seem taller?"
"My guess would be you're some sort of lich with an illusion spell to mimic the face of a true Wyvernspur."
He cast a simple illusion spell upon the reflection of the young deer.
And that was a new thing indeed, for before this Kethry had never been able to change size or general shape in her illusion spells.