[HoMM V]9 Race - Swamp! Is it needed?

then the siege weapons (ballista and catapult) would be damaged, swell, and become moldy, and each time they attack, they would take damage. The same could be done with castle walls; the water would erode them, making them easier to destroy.

Here's a new skill:
CHAOS - Lord of Storms - Monsoon - Mold