Slow Storm
Huge elemental, chaotic neutral
Armor Class
19
Hit Points
225 (18d12 + 108)
Speed
0 ft., fly 60 ft. (hover)
STR
20 (+5)
DEX
19 (+4)
CON
22 (+6)
INT
11 (+0)
WIS
16 (+3)
CHA
11 (+0)
Damage Immunities
lightning
Damage Resistances
acid, cold, fire
Condition Immunities
prone
Senses
blindsight 30 ft., darkvision 120 ft., passive Perception 13
Saving Throws
Dex +9, Con +11
Languages
Common, Primordial
Challenge
15 (13000 XP)
Bone Wrack. When hit by the slow storm’s slam or breath weapon attack, the storm absorbs moisture from the living creatures’ joints, causing stiffness and pain. In addition to 1d4 Dexterity drain, any creature caught within the slow storm’s breath weapon that fails another DC 18 Constitution save suffers crushing pain in bones and joints. Any round in which the pained creature moves, it takes 1d4 necrotic damage per 5 feet moved. Bone wracking pain lasts until the affected creature regains at least 1 point of lost Dexterity.
Innate Spellcasting. The slow storm’s innate spellcasting ability is Wisdom (spell save DC 16). It can innately cast the following spells, requiring no material components:
At will: lightning bolt
3/day: chain lightning
Storm Form. A creature that enters or starts its turn inside the slow storm’s whirlwind takes 9 (2d8) force damage. A creature can take this damage just once per round. In addition, ranged missile weapon attacks against the slow storm have disadvantage because of the high-speed wind.
Actions
Slam. Melee Weapon Attack: +10 to hit, reach 15 ft., one target. Hit: 31 (4d12 + 5) bludgeoning damage plus 9 (2d8) piercing damage.
Static Shock (Recharge 5-6). The slow storm exhales its electrical power in a 30-foot cone. Targets in the area of effect take 54 (12d8) lightning damage, 1d4 Dexterity loss, and suffer bone wrack. A successful DC 18 Constitution saving throw halves the Dexterity loss and prevents the bone wrack.