Adult Gold Dragon

If the monster fails a saving throw, it can choose to succeed instead.

The monster can breathe air and water.

The monster makes three attacks. It can replace one attack with a use of (A) to cast Guiding Bolt (level 2 version) or (B) .

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Dexterity Saving Throw: DC , each in a -foot-long, -foot-wide Line.
Failure: damage.
Success: Half damage.

The monster casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC ):
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

Strength Saving Throw: DC , each creature that isn't currently affected by this breath in a -foot Cone.
Failure: The target has Disadvantage on Strength-based D20 Tests and subtracts 3 () 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 minute, it succeeds automatically.