Nym

Huge Giant, Neutral Evil

AC: 12

Initiative: +2 (12)

HP: 230 (20d12 + 100)

Speed: 50 ft., swim 50 ft.

STR: 29 (+9)
DEX: 14 (+2)
CON: 20 (+5)
INT: 16 (+3)
WIS: 18 (+4)
CHA: 18 (+4)

Saving Throws: Str +14, Con +10, Wis +9, Cha +9

Skills: Arcana +8, Athletics +14, Deception +9, History +8, Perception +9, Performance +9

Resistances: cold

Immunities: lightning; thunder

Senses: Passive Perception 19

Languages: Common, Giant

CR: 13 (XP 10,000; PB +5)

Habitat: Coastal, Underwater

Amphibious.

Nym can breathe air and water.

Innate Spellcasting.

Nym's innate spellcasting ability is Charisma (spell save DC 17). It can innately cast the following spells, requiring no material components:

At will: detect magic, feather fall, levitate, light

3/day each: control weather, water breathing

Actions

Multiattack.

Nym makes two greatsword attacks.

Greatsword.

Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 30 (6d6 + 9) slashing damage.

Rock.

Ranged Weapon Attack: +14 to hit, range 60/240 ft., one target. Hit: 35 (4d12 + 9) bludgeoning damage.

Lightning Strike (Recharge 5-6).

Nym hurls a magical lightning bolt at a point it can see within 500 feet of it. Each creature within 10 feet of that point must make a DC 17 Dexterity saving throw, taking 54 (12d8) lightning damage on a failed save, or half as much damage on a successful one.

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Source: Storm King's Thunder, p. 207 - Licenses and attribution