Tecuziztecatl

Large Monstrosity, Neutral

AC: 13

Initiative: +0 (10)

HP: 102 (12d10 + 36)

Speed: 30 ft., climb 30 ft., swim 30 ft.

STR: 17 (+3)
DEX: 10 (+0)
CON: 16 (+3)
INT: 15 (+2)
WIS: 16 (+3)
CHA: 13 (+1)

Skills: Deception +3, Stealth +2

Resistances: bludgeoning from nonmagical attacks

Immunities: acid

Senses: blindsight 30 ft., Passive Perception 13

Languages: Olman, Primordial

CR: 4 (XP 1,100; PB +2)

Amphibious.

Tecuziztecatl can breathe air and water.

Glowing.

Tecuziztecatl sheds dim light within 20 feet of itself.

Flexible.

Tecuziztecatl can enter a space large enough for a Medium creature without squeezing.

Spider Climb.

Tecuziztecatl can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Actions

Multiattack.

Tecuziztecatl makes two pseudopod attacks.

Pseudopod.

Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 12 (2d8 + 3) bludgeoning damage.

Spit Acid (Recharge 4-6).

Tecuziztecatl exhales acid in a 30-foot line that is 5 feet wide. Each creature in that line must make a DC 13 Dexterity saving throw, taking 18 (4d8) acid damage on a failed save, or half as much damage on a successful one.

Find this creature in the encounter builder

Source: Tales from the Yawning Portal, p. 245 - Licenses and attribution