Let’s come up with new “war machines.”

Great idea! First, Orcs could have a ram, Gnomes could have a fire siphon, and Elves could have healing fairies near their tents. Undead could have corpse carriers that provide additional troops. Humans could have siege towers. Mages could have some kind of aerial barrage against walls. Demons could have living fire of destruction, and Dark spells could attack walls, for example, with a rain of meteors.