Ancient Black Dragon
Gargantuan Dragon (Chromatic), Chaotic Evil
AC 22 Initiative +16 (26)
HP 367 (21d20 + 147)
Speed 40 ft., Fly 80 ft., Swim 40 ft.
| Ability (Score) | Modifier | Save |
|---|---|---|
| Str 27 | +8 | +8 |
| Dex 14 | +2 | +9 |
| Con 25 | +7 | +7 |
| Int 16 | +3 | +3 |
| Wis 15 | +2 | +9 |
| Cha 22 | +6 | +6 |
Skills Perception +16, Stealth +9
Immunities Acid
Senses Blindsight 60 ft., Darkvision 120 ft.; Passive Perception 26
Languages Common, Draconic
CR 21 (XP 33,000, or 41,000 in lair; PB +7)
Traits
Amphibious. The dragon can breathe air and water.
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 Acid Arrow (level 4 version).
Rend. Melee Attack Roll: +15, reach 15 ft. Hit: 17 (2d8 + 8) Slashing damage plus 9 (2d8) Acid damage.
Acid Breath (Recharge 5-6). Dexterity Saving Throw: DC 22, each creature in a 90-foot-long, 10-foot-wide Line. Failure: 67 (15d8) Acid damage. Success: Half damage.
Spellcasting. The dragon casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 21, +13 to hit with spell attacks):
At Will: Acid Arrow (level 4 version), Detect Magic , Fear
1/Day Each: Create Undead , Speak with Dead , Vitriolic Sphere (level 5 version)
Legendary Actions
Legendary Action Uses: 3 (4 in Lair). Immediately after another creature's turn, the dragon can expend a use to take one of the following actions. The dragon regains all expended uses at the start of each of its turns.
Cloud of Insects. Dexterity Saving Throw: DC 21, one creature the dragon can see within 120 feet. Failure: 33 (6d10) Poison damage, and the target has Disadvantage on saving throws to maintain Concentration until the end of its next turn. Failure or Success: The dragon can't take this action again until the start of its next turn.
Frightful Presence. The dragon uses Spellcasting to cast Fear . 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.