The ballista is a level-two creature from the Haven town in Heroes of Might and Magic IV. The ballista has useful abilities and decent damage, but is somewhat hampered by the lower movement - it's slower than any other unit in the Haven army, and will slow the other units down. On the other hand, it's perfect for defending the town in sieges, or attacking towns. It can be brought when preparing for a siege, but don't wander around the map with it.