I really like the demolitionist class and explosions. There is a note in Fort Ikkon from aetherials shocked at humans’ explosives and a quest from the Black Legion to retrieve a cannon.
From a gameplay perspective, I think a cannon like in the image would also be a better fit:
Mortars are supposed to do huge damage at very long range but to be very difficult to accurately hit. In this game it wouldn’t work and their range is already quite high, but the damage and rate of fire besides the big one don’t really function great.
A cannon would be a direct hit, look cooler, and be more reliable as a primary source of damage. The projectile would have higher speed, with maybe a longer cooldown between shots but with higher damage.
Don’t get me wrong though, I like the mortar trap a lot, but I think I’d like a cannon even more.