Catapults

Bahamut, the Volcanic Dragon

 * Needs 30 people to launch
 * Does 7,986,000 damage

Ragnarok, the Ice Elemental

 * Needs 30 people to launch
 * Does 7,260,000 damage

Cronus, The World Hydra

 * Needs 10 people to launch
 * Does 1,340,000 damage

Deathrune Siege

 * Needs 80 (for Advanced Campaign II) or 30 (for Easy Campaign I) people to launch
 * Damage: 300 kills