Water Elemental Myrmidon

Medium Elemental, Neutral

AC: 18

Initiative: +2 (12)

HP: 127 (17d8 + 51)

Speed: 40 ft., swim 40 ft.

STR: 18 (+4)
DEX: 14 (+2)
CON: 16 (+3)
INT: 8 (-1)
WIS: 10 (+0)
CHA: 10 (+0)

Resistances: acid; bludgeoning, piercing, slashing from nonmagical attacks

Immunities: poison

Condition Immunities: paralyzed; petrified; poisoned; prone

Senses: darkvision 60 ft., Passive Perception 10

Languages: Aquan, one language of its creator's choice

CR: 7 (XP 2,900; PB +3)

Actions

Multiattack.

The myrmidon makes three Trident attacks.

Trident.

Melee or Ranged Weapon Attack: +7 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 7 (1d6 + 4) force damage, or 8 (1d8 + 4) force damage if used with two hands to make a melee attack.

Freezing Strikes (Recharge 6).

The myrmidon uses Multiattack. Each attack that hits deals an extra 5 (1d10) cold damage. A target that is hit by one or more of these attacks has its speed reduced by 10 feet until the end of the myrmidon's next turn.

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Source: Mordenkainen Presents: Monsters of the Multiverse, p. 123 - Licenses and attribution