Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.
Acid. When directly touched it caused 3d8
Multiattack. It makes one spit attack. It then makes three attacks: one with its throw and two with its smack.
Throw. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) piercing damage plus 8 (2d8) acid damage.
Smack. Melee Weapon Attack: +11 to hit, reach 20 ft., one target. Hit: 7 (2d6 + 6) bludgeoning damage.
Spit The ooze exhales acid in a 30 foot sphere Each creature in that line must make a DC 18 Dexterity saving throw, taking 12 (6d6) acid damage on a failed save, or half as much damage on a successful one.
The dragon can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The dragon regains spent legendary actions at the start of its turn.
Detect. The dragon makes a Wisdom (Perception) check.
Throw. The dragon makes a tail attack.
Spit. It makes a spit attack
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