Amphibious
The dragon can breathe air and water.
Ancient Black Dragon
Gargantuan Dragon · Chaotic Evil
Armor Class22
Hit Points367 (21d20 + 147)
SpeedWalk 40 ft., Fly 80 ft., Swim 40 ft.
Challenge21
STR27
DEX14
CON25
INT16
WIS15
CHA22
Traits
Legendary Resistance (4/Day, or 5/Day in Lair)
If the dragon fails a saving throw, it can choose to succeed instead.
Actions
Multiattack
The dragon makes three Rend attacks. It can replace one attack with a use of Spellcasting to cast (level 4 version).
Rend
Melee Attack +15, reach 15 ft. 17 () 🗡️ Slashing damage plus 9 () 🧪 Acid damage.
Acid Breath Recharge 5
DEX Save DC 22, each creature in a 90-foot-long, 10-foot-wide Line [Area Of Effect].
Failure: 67 () 🧪 Acid damage.
Success: Half damage.
Failure: 67 () 🧪 Acid damage.
Success: Half damage.
Legendary Actions
Cloud of Insects
DEX Save DC 21, one creature the dragon can see within 120 feet.
Failure: 33 () ☠️ Poison damage, and the target has Disadvantage on saving throws to maintain Concentration until the end of its next turn.
Success or Failure: The dragon can't take this action again until the start of its next turn.
Failure: 33 () ☠️ Poison damage, and the target has Disadvantage on saving throws to maintain Concentration until the end of its next turn.
Success or Failure: The dragon can't take this action again until the start of its next turn.
Frightful Presence
The dragon uses Spellcasting to cast . The dragon can't take this action again until the start of its next turn.
Pounce
The dragon moves up to half its Speed, and it makes one Rend attack.