Adult Brass Dragon

Huge dragon · CR 13

Armor Class 18

Hit Points 172 (15d12+75)

Speed burrow 40 ft., fly 80 ft., 40 ft.

STR 23 +6

DEX 10 +0

CON 21 +5

INT 14 +2

WIS 13 +1

CHA 17 +3

Saving Throws CHA+8, CON+10, DEX+5, WIS+6

Skills history +7, perception +11, persuasion +8, stealth +5

Damage Immunities fire

Senses blindsight60 ft., darkvision120 ft. , passive Perception 21

Languages Common, Draconic

Traits

Legendary Resistance (3/Day).: If the dragon fails a saving throw, it can choose to succeed instead.

Actions

Multiattack.: The dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.
Bite. Melee/Ranged Weapon Attack: +11 to hit.: Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) piercing damage.
Claw. Melee/Ranged Weapon Attack: +11 to hit.: Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) slashing damage.
Tail. Melee/Ranged Weapon Attack: +11 to hit.: Melee Weapon Attack: +11 to hit, reach 15 ft., one target. Hit: 15 (2d8 + 6) bludgeoning damage.
Frightful Presence.: Each creature of the dragon's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 16 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.
Breath Weapons (Recharge 5-6). Melee/Ranged Weapon Attack: +0 to hit.: The dragon uses one of the following breath weapons. **Fire Breath.** The dragon exhales fire in an 60-foot line that is 5 feet wide. Each creature in that line must make a DC 18 Dexterity saving throw, taking 45 (13d6) fire damage on a failed save, or half as much damage on a successful one. **Sleep Breath.** The dragon exhales sleep gas in a 60-foot cone. Each creature in that area must succeed on a DC 18 Constitution saving throw or fall unconscious for 10 minutes. This effect ends for a creature if the creature takes damage or someone uses an action to wake it.

Legendary Actions

The Adult 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 creature regains spent legendary actions at the start of its turn.

Detect.: The dragon makes a Wisdom (Perception) check.
Tail Attack.: The dragon makes a tail attack.
Wing Attack (Costs 2 Actions) (Costs 2 Actions).: The dragon beats its wings. Each creature within 10 ft. of the dragon must succeed on a DC 19 Dexterity saving throw or take 13 (2d6 + 6) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.