Sources
CR
Type
Size
Alignment
Movement

Thousand Teeth

Large Monstrosity, Neutral Evil

Armor Class 12 (natural armor)
Hit Points 93 (11d10 + 33)
Speed 30 ft., swim 50 ft.
STR
19
+4
DEX
10
+0
CON
17
+3
INT
2
-4
WIS
10
+0
CHA
7
-2
Saving Throws STR +7, CON +6
Skills Athletics +7, Stealth +3
Senses passive Perception 10
Languages
Challenge 6 (2,300 XP)

Traits

Hold Breath. Thousand Teeth can hold its breath for 30 minutes.

Legendary Resistance (2/Day). If Thousand Teeth fails a saving throw, it can choose to succeed instead.

Actions

Multiattack. Thousand Teeth makes two attacks: one with its bite and one with its tail.

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit:15 (2d10 + 4) piercing damage.

Tail. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit:8 (1d8 + 4) bludgeoning damage. If the target is a creature, it must succeed on a DC 15 Strength saving throw or be knocked prone.

Legendary Actions

Detect. Thousand Teeth makes a Wisdom (Perception) check.

Lunge. Thousand Teeth moves up to half its speed.

Bite (Costs 2 Actions). Thousand Teeth makes a bite attack.

Lore

Thousand Teeth is an ancient crocodilian nightmare that has served as the apex predator in the swamps near Saltmarsh for as long as anyone can remember. This monster recently fought a number of lizardfolk and lost one of its teeth. Angered and hungry, it sulks in its lair, lost in primal dreams of rending and tearing. It is found in the deep marshes in Danger at Dunwater.