War machines in Heroes V.

I tested it myself, and a well-upgraded ballista for the Elves is, to put it mildly, devastating. When I enchanted the ballista (arrow) with Earth Shock, it leaves nothing alive, not even golems are immune to magic resistance; they die. Just imagine: three shots plus a spell cast on the target for each shot – you can enchant it with Meteor Shower or something else. In short, it's awesome; I wiped everyone out, as always, and I'm satisfied!