Tactics for the Swamp (Fortress).

Starting from level 3, the improved creatures in the swamp, instead of physical strength, gain useful abilities. Snakes remove all beneficial effects from enemy creatures and replace them with weakness. Basilisks turn enemy creatures to stone with their gaze, and gorgons kill additional monsters (an especially important ability when fighting creatures of levels 6-7), while wyverns reduce the enemy's hit points, and hydras attack multiple creatures at once, and no one can retaliate!