Laari
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What is offensive fire magic? Is it Inferno? Or Armageddon, which kills everyone? =)))
And Earth has a 5th-level spell, I don't remember the name, it looks like a cauldron... Disintegration (Immolation) or something like that... It's a powerful spell.
Air has Lightning and Chain Lightning...
Even Inferno will do....
It will work on skeletons....
Armageddon can be useful if your hero is about to lose (he has only a couple of skeletons left), so you can at least give the enemy one last kick.
Curse and Bloodlust also work well at the Expert level ;)