Adult Copper Dragon

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

The monster makes three attacks. It can replace one attack with a use of (A) or (B) to cast Mind Spike (level 4 version).

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Dexterity Saving Throw: DC , each in a -foot-long, -foot-wide Line.
Failure: damage.
Success: 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, Mind Spike (level 4 version), Minor Illusion, 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: Greater Restoration, Major Image

Constitution Saving Throw: DC , each creature in a -foot Cone.
Failure: The target can't take Reactions; its Speed is halved; and it can take either an action or a Bonus Action on its turn, not both. This effect lasts until the end of its next turn.