Hit an Ashwake Dragon with Fracture.
Also I'm unclear, the description on immune to magic seems to imply it makes them immune to spells they can _resist_, but not regular damage spells (other than fire ones anyway). Is that the correct behavior? (assuming it worked properly)
If thats the proper behavior, the attribute name should be changed to Resistant to Magic, not Immune.
edit: Related, immune monsters have no 'Immune' popup if you hit them with that damage type
