Ancient Bronze Dragon

Amphibious. The dragon can breathe air and water.

Legendary Resistance (4/Day, or 5/Day in Lair). If the dragon fails a saving throw, it can choose to succeed instead.

Lightning Breath. Dexterity Saving Throw: DC 23, each creature in a 120-foot-long, 10-foot-wide Line. Failure: 82 (15d10) Lightning damage. Success: Half damage.

Multiattack. The dragon makes three Rend attacks. It can replace one attack with a use of (A) Repulsion Breath or (B) Spellcasting to cast Guiding Bolt (level 2 version).

Rend. Melee Attack Roll: +16, reach 15 ft. 18 (2d8 + 9) Slashing damage plus 9 (2d8) Lightning damage.

Repulsion Breath. Strength Saving Throw: DC 23, each creature in a 30-foot Cone. Failure: The target is pushed up to 60 feet straight away from the dragon and has the Prone condition.

Spellcasting. The dragon casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 22, +14 to hit with spell attacks): - **At Will:** Detect Magic, Guiding Bolt, Shapechange, Speak with Animals, Thaumaturgy - **1/Day Each:** Detect Thoughts, Control Water, Scrying, Water Breathing