Ancient Brass Dragon
Gargantuan dragon, chaotic good
Armor Class 20 (natural armor)
Hit Points 332 (19d20 + 133)
Speed 40 ft., fly 80 ft., swim 20 ft., climb 20 ft., burrow 40 ft.
str
27 (+8)
dex
10 (+0)
con
25 (+7)
int
16 (+3)
wis
15 (+2)
cha
22 (+6)
Saving Throws Dex +6, Wis +8
Skills History +9, Perception +14, Persuasion +12, Stealth +6
Damage Immunities fire
Senses blindsight 60 ft., darkvision 120 ft., passive Perception 24
Languages Common, Draconic
Challenge 20 (25,000 XP)
Legendary Resistance (4/Day, or 5/Day in Lair). If the dragon fails a saving throw, it can choose to succeed instead.
Actions
Fire Breath. Dexterity Saving Throw: DC 21, each creature in a 90-foot-long, 5-foot-wide Line. Failure: 58 (13d8) Fire damage. Success: Half damage.
Multiattack. The dragon makes three Rend attacks. It can replace one attack with a use of (A) Sleep Breath or (B) Spellcasting to cast Scorching Ray (level 3 version).
Rend. Melee Attack Roll: +14, reach 15 ft. 19 (2d10 + 8) Slashing damage plus 7 (2d6) Fire damage.
Sleep Breath. Constitution Saving Throw: DC 21, each creature in a 90-foot Cone. Failure: The target has the Incapacitated condition until the end of its next turn, at which point it repeats the save. Second Failure The target has the Unconscious condition for 10 minutes. This effect ends for the target if it takes damage or a creature within 5 feet of it takes an action to wake it.
Spellcasting. The dragon casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 20): - **At Will:** Detect Magic, Minor Illusion, Scorching Ray, Shapechange, Speak with Animals - **1/Day Each:** Control Weather, Detect Thoughts
Spellcasting (CHA, DC 20, +12 to hit)
At Will: Detect Magic, Minor Illusion, Scorching Ray, Shapechange, Speak with Animals
1/Day Each: Control Weather, Detect Thoughts
Attack Summary
Legendary Actions
The ancient brass 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 ancient brass dragon regains spent legendary actions at the start of its turn.
Blazing Light. The dragon uses Spellcasting to cast Scorching Ray (level 3 version).
Pounce. The dragon moves up to half its Speed, and it makes one Rend attack.
Scorching Sands. Dexterity Saving Throw: DC 20, one creature the dragon can see within 120 feet. Failure: 36 (8d8) Fire damage, and the target's Speed is halved 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.