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Image prompthuge water elemental lancer, towering coiling column of dark ocean, swirling torso firing compressed water-jet lances, rising from undersea trench, dragging undertow currents, translucent silt-swirled body, deep abyssal blues foam-white, suspended bioluminescent motes, black water, ranged spearing pose, dark fantasy, grimdark, painterly digital art, dramatic chiaroscuro lighting, muted desaturated palette with corrupted-crimson accents, weathered post-Cataclysm atmosphere, intricate high detail, cinematic composition

Pressure Lancer

Huge Elemental, Neutral
CR 10ArtilleryUnderwater / Coastal
AC 17
STR
20
+5
save +5
DEX
17
+3
save +7
CON
22
+6
save +10
INT
10
+0
save +0
WIS
16
+3
save +7
CHA
12
+1
save +1
Resistances Fire; Bludgeoning, Piercing, Slashing (nonmagical)
Immunities Poison; Exhaustion, Grappled, Paralyzed, Poisoned, Prone, Restrained
Senses Blindsight 120 ft.; Passive Perception 13 · Languages Primordial (Aquan)

Traits

Point Blank Weakness. With an enemy within 5 feet, ranged attacks have Disadvantage. Water Form. Can pass through a 1-inch gap. Undertow. An enemy that ends its turn within 20 feet makes a DC 18 STR save. Failure: Pulled 15 feet toward the Pressure Lancer.

Actions

Multiattack. Three Hydro Lance attacks. Hydro Lance. Ranged Attack Roll: +7, range 120 ft. Hit: 22 (4d8 + 4) Bludgeoning damage. The target makes a DC 18 STR save; on a failure, pushed back 15 feet and Prone. Maelstrom (Recharge 5–6). A 30-foot-radius Sphere within 60 feet. DC 18 STR save. Failure: 45 (10d8) Bludgeoning damage, the Restrained condition (caught in the vortex; escape DC 18), and pulled to the center. Success: Half.

Key

Close the distance (no melee attack), but Undertow is already pulling you in — that's good! Let it do what it wants, then fight it up close. Freedom of Movement cancels Undertow and Maelstrom.