Ancient Black Dragon 2014

The dragon roars at up to two creatures of its choice within 120 feet of it. Each target must succeed on a DC 18 CHA save or be vulnerable to acid damage until the end of its next turn. A target resistant to acid damage isn't resistant to it for the duration. A target immune to acid damage is still immune to it, even if the target fails the save.

The dragon uses its Frightful Presence. It then makes one Bite attack and two Claw attacks.

The dragon beats its wings. Each creature within 15 feet of the dragon must succeed on a DC 23 DEX save or take 16 (2d6+9) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed without provoking opportunity attacks.

Melee Weapon Attack: +15 to hit, reach 15 ft., one target. Hit: 20 (2d10+9) piercing damage plus 9 (2d8) acid damage.

Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 16 (2d6+9) slashing damage.

Melee Weapon Attack: +15 to hit, reach 20 ft., one target. Hit: 18 (2d8+9) bludgeoning damage.

Each creature of the dragon's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 18 WIS save or be frightened for 1 minute. A creature can repeat the save at the end of each of its turns, ending the effect on itself on a success. If a creature's save is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.

The dragon exhales acid in a 90-foot line that is 10 feet wide. Each creature in that line must make a DC 21 DEX save, taking 67 (15d8) acid damage on a failed save, or half as much damage on a successful one.

The dragon automatically detects every creature and trap within 30 feet of it, pinpointing the current location of each.

The dragon makes a Tail attack.

The dragon roars at up to two creatures of its choice within 120 feet of it. Each target must succeed on a DC 18 CHA save or be vulnerable to acid damage until the end of its next turn. A target resistant to acid damage isn't resistant to it for the duration. A target immune to acid damage is still immune to it, even if the target fails the save.

The dragon beats its wings. Each creature within 15 feet of the dragon must succeed on a DC 23 DEX save or take 16 (2d6+9) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed without provoking opportunity attacks.