RTF is a global modification that replaces all towns in the game.

Ideally, such a war machine should differ from a regular ballista not only in its appearance, color, and electrical or fire effects. It would also be good to give it at least a speed of 1. In theory, artillery should be very effective in long-range combat and easily destroyed in close combat, and considering that it is a "large creature," the probability of it being taken out will be very high. Also, there shouldn't be too many of these units. To avoid parallels with the ballista of war machines, I would suggest designing this unit as a cannon or mortar with an area-of-effect attack of 3x3, or simply give it a "crossfire attack." As I wrote above, this unit should not be numerous, which means its tier should be at least five, and it should be made to match this level (some kind of hellish machine sweeping everything in its path).