Water Elemental, Primal

Colossal (Elemental (Water, Extraplanar)) CR 35
HP 1,048 hp, hd64d8+640 AC 64 (?8 size, +14 Dex, +48 natural), touch 16, flat-fooded 50 Fort +46, Ref +21, Will +28 Speed 20 ft., swim 90 ft. Initiative +14 (Dex) Spot , Listen
Standard attacks BAB +48, Grapple +80
Attacks
Full attack: 2 slam +57 (4d10+24/19-20)
Special Attacks/Qualities
Water mastery, drench, vortex
Elemental traits, DR 15/?, SR 42
Skills Jump +7, Listen +57, Spot +48, Swim +19
Feats Alertness, Cleave, Combat Reflexes, Dodge, Great Cleave, Improved Critical (slam), Improved Sunder
Str 42 Con 31 Dex 38 Int 8 Wis 13 Cha 13
Alignment Usually neutral, Environment Any land, Organisation Solitary

A primal water elemental can?t venture more than 360 feet from the body of water from which it emerged. Water elementals speak Aquan.

Water Mastery (Ex): A water elemental gains a +1 bonus on attack and damage rolls if both it and its opponent touch water. If the opponent or elemental is land-bound, the elemental takes a ?4 penalty on attack and damage rolls. (These modifiers are not included in the statistics block.) A primal water elemental can be a serious threat to a ship that crosses its path. It can easily overturn even large craft (ships of up to 5 feet in length per Hit Dice of the elemental) and stop massive vessels (ships of less than 10 feet in length per HD). Even ocean-going behemoths (ships of less than 20 feet in length per HD) can be slowed to half speed.
Drench (Ex): The elemental?s touch puts out torches, campfires, exposed lanterns, and other open flames of non-magical origin if these are Gargantuan or smaller. The creature can dispel magical fire it touches as dispel magic cast by a caster whose level equals the elemental?s HD total (64).
Vortex (Su): The elemental can transform itself into a whirlpool once every 10 minutes, provided it is underwater, and remain in that form for up to 1 round for every 2 HD it has (48 rounds). In vortex form, the elemental can move through the water or along the bottom at its swim speed. The vortex is 5 feet wide at the base, up to 50 feet wide at the top, and up to 80 feet tall. The elemental controls its exact height, but it must be at least 10 feet. Gargantuan and smaller creatures might take damage when caught in the vortex and may be swept up by it. An affected creature must succeed at a Reflex save (DC 58) when it comes into contact with the vortex or take 4d10 points of damage. It must also succeed at a second Reflex save (DC 68) or be picked up bodily and held suspended in the powerful currents, automatically taking 4d10 points of damage each round. A creature that can swim is allowed a Reflex save (DC 58) each round to escape the vortex. The creature still takes damage, but can leave if the save is successful. The elemental can eject any carried creatures whenever it wishes, depositing them wherever the vortex hap-pens to be. A summoned elemental always ejects trapped creatures before returning to its home plane. If the vortex?s base touches the bottom, it creates a swirling cloud of debris. This cloud is centered on the elemental and has a diameter equal to half the vortex?s height. The cloud obscures all vision, including dark-vision, beyond 5 feet. Creatures 5 feet away have one-half concealment, while those farther away have total concealment. Those caught in the cloud must succeed at a Concentration check (DC 58) to cast a spell. The DC is Strength-based.
Elemental Traits: Immune to poison, sleep, paralysis, and stunning. Not subject to critical hits.

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System Reference Document -> Epic Creatures (SRD)