Design: Mk 2 Magic Cannon [3, 3, 1]
We make some minor quality-of-life improvements to the design, but our major fixes struggle.
Firstly, a relatively simple adjustment to the wooden carriage allows the cannon to be fired from 45° up to 90° down. This is useful for emplacing the cannon on walls, and allowing it to fire directly down at enemies at our gates. Firing at below 0° horizontal results in greater and greater recoil, however, and the cannon must be readjusted between each firing.
Secondly, we set up production for iron cannon ball ammunition. These are heavier and slightly more expensive to produce, but they don't typically shatter in the barrel. The downside is that they must be cast from the supply centers in our backlines and shipped forward, although in a pinch our siege engineers can take the time to chisel stone shot if supplies get disrupted.
Our success ends there, sadly. An attempt was made to copy the cold inscriptions used in our Tower of Frost and apply them to the barrel to prevent overheating. Due to the complexity of the cold spell we had to cut a few corners in the spell. The result is a barrel so cold that it cracks instantly after being fired once - that is, if the cannon ball doesn't get caught in the smaller barrel and cause an explosion. Since we couldn't get the cold spell to work correctly we didn't have much success with our experimental steam recycler; most of the steam is lost out the barrel anyways, and what does get condensed freezes on the inside. If by some miracle the cannon doesn't crack after the first shot, the ice causes the shot to jam and result in an explosion on the second.
The cold-inscription process is time consuming and requires expensive materials and skilled labor to do, making it Very Expensive. Our forces will continue to use the Mk1 until the bugs are fixed with the Mk2.