These dragons are roughly the size of an elephant. They are green with small vestigal wings, and are characterized by a single horn on their foreheads.
Although cumbersome and slow, these are still fearsome creatures, because the only part of their bodies vulnerable to physical attack are their heads, although magical blasts will affect them no matter where they are struck. Also, they shoot fireballs at Attack 10 with a Range Multiplier of 1. These fireballs have a Penetration Factor of 3, and inflict 2 points of damage. An Aquamentus will shoot three of these in roughly the same direction (about 5 degrees apart) every 5 seconds.