Ancient Bronze Dragon
Gargantuan Dragon (metallic), Lawful GoodAC 22
HP 444 (24d20 + 192)
Speed 40 ft., fly 80 ft., swim 40 ft.
STR
29 (+9)
Save +9
DEX
10 (+0)
Save +7
CON
27 (+8)
Save +8
INT
18 (+4)
Save +4
WIS
17 (+3)
Save +10
CHA
25 (+7)
Save +7
Saving Throws DEX +7, WIS +10
Skills Insight +10, Perception +17, Stealth +7
Immunities Lightning
Senses Blindsight 60 ft., Darkvision 120 ft., Passive Perception 27
Languages Common, Draconic
CR 22
Traits
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.
Actions
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. Hit: 18 (2d8 + 9) Slashing damage plus 9 (2d8) Lightning damage.
Lightning Breath (Recharge 5+). dex 23, each creature in a 120-foot-long, 10-foot-wide Line. Failure: 82 (15d10) Lightning damage. Success: Half damage.
Repulsion Breath. str 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.
Legendary Actions
Guiding Light. The dragon uses Spellcasting to cast Guiding Bolt (level 2 version).
Pounce. The dragon moves up to half its Speed, and it makes one Rend attack.
Thunderclap. con 22, each creature in a 20-foot-radius Sphere centered on a point the dragon can see within 120 feet. Failure: 13 (3d8) Thunder damage, and the target has the Deafened condition until the end of its next turn.