[llamabeast]

Crumble is even better than its description says - it's guaranteed to bring the walls down in a single casting! Sometimes a very worthwhile use of 20 gems, e.g. if you've captured a castled province using a single SC who will never bring the walls down by himself. If you time the spell so it's cast the same turn the SC attacks the province, you can burst in immediately on the following turn. Blitzkrieg!