A kongamato can fly high into the air with a boulder, log, or similar massive object in tow and dive directly at its target hurling the missile in its descent. It normally does this when starting a battle. The kongamato lifts an immense boulder into the air and drop it on its foes. This boulder affects a 15-foot square area, dealing 39 (4d6+25) points of bludgeoning damage to all creatures in the area on a failed DC 18 Dexterity saving throw, or half as much damage on a success. In addition, Medium or smaller creatures failing their saves are pinned under the boulder, gaining the immobilized condition and taking damage again each round at the end of their turn if they do not escape (escape DC 18). Frightful Presence. Each creature within 120 feet that can hear when the kongamato uses its thunder breath must succeed on a DC 18 Wisdom saving throw or become frightened for 1 minute. A frightened creature repeats the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the kongamato's Frightful Presence for the next 24 hours.