Dexterity +8, Wisdom +8
Insight +8, Perception +14, Persuasion +13, Stealth +8
+14
Blindsight 60 ft, Darkvision 120 ft
Common, Draconic
Fire
Traits
Legendary Resistance
3/day (4/day in lair). If the adult gold dragon fails a saving throw, it can choose to succeed instead.
Amphibious
The adult gold dragon can breathe air and water.
Actions
Multiattack
The adult gold dragon makes three Rend attacks. It can replace one attack with a use of (A) Spellcasting to cast Guiding Bolt (level 2 version) or (B) Weakening Breath.
Rend
Melee Weapon Attack: +14 to hit, reach 10 ft.. Hit: 17 (2d8 + 8) slashing plus 4 (1d8) fire damage.
Fire Breath
Recharge 5–6. Dexterity Saving Throw: DC 21, each creature in a 15-foot-long, 5-foot-wide Line.
Failure: 66 (12d10) fire damage.
Success: Half damage.
Spellcasting
1 use per day. The adult gold dragon casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 21):
At Will: Detect Magic, Guiding Bolt (level 2 version), Shapechange (Beast or Humanoid form only, no Temporary Hit Points gained from the spell, and no Concentration or Temporary Hit Points required to maintain the spell)
1/Day Each: Flame Strike, Zone of Truth
Weakening Breath
Strength Saving Throw: DC 13, each creature that isn't currently affected by this breath in a 60-foot Cone.
Failure: The target has Disadvantage on Strength-based D20 Tests and subtracts 3 (1d6) from its damage rolls. It repeats the save at the end of each of its turns, ending the effect on itself on a success. After 1 minute, it succeeds automatically.
Legendary Actions
3 legendary actions (4 in its lair). Only one legendary action can be used at a time and only at the end of another creature's turn. This creature regains spent legendary actions at the start of its turn.
Banish
Charisma Saving Throw: DC 21, one creature the adult gold dragon can see within 120 feet.
Failure: 10 (3d6) force damage, and the target has the Incapacitated condition and is transported to a harmless demiplane until the start of the adult gold dragon's next turn, at which point it reappears in an unoccupied space of the adult gold dragon's choice within 120 feet of the adult gold dragon.
Failure or Success: The adult gold dragon can't take this action again until the start of its next turn.
Guiding Light
The adult gold dragon uses Spellcasting to cast Guiding Bolt (level 2 version).
Pounce
The adult gold dragon moves up to half its Speed, and it makes one Rend attack.
Prepared Spells
Detect Magic, Guiding Bolt, Shapechange, Flame Strike, Zone Of Truth, Guiding Bolt