Dragon Turtle

Gargantuan Dragon, Neutral

AC 20Initiative +6 (16)

HP 356 (23d20 + 115)

Speed 20 ft., Swim 50 ft.

STR
25
Mod +7
Save +7
DEX
10
Mod +0
Save +0
CON
20
Mod +5
Save +11
INT
10
Mod +0
Save +0
WIS
12
Mod +1
Save +7
CHA
12
Mod +1
Save +1

Resistances Fire

Senses Darkvision 120 ft.; Passive Perception 11

Languages Draconic, Primordial (Aquan)

CR 17 (XP 18,000; PB +6)

Traits

Amphibious. The dragon can breathe air and water.

Actions

Multiattack. The dragon makes three Bite attacks. It can replace one attack with a Tail attack.

Bite. Melee Attack Roll: +13, reach 15 ft. Hit: 23 (3d10 + 7) Piercing damage plus 7 (2d6) Fire damage. Being underwater doesn't grant Resistance to this Fire damage.

Tail. Melee Attack Roll: +13, reach 15 ft. Hit: 18 (2d10 + 7) Bludgeoning damage. If the target is a Huge or smaller creature, it has the Prone condition.

Steam Breath (Recharge 5-6). Constitution Saving Throw: DC 19, each creature in a 60-foot Cone. Failure: 56 (16d6) Fire damage. Success: Half damage. Failure or Success: Being underwater doesn't grant Resistance to this Fire damage.