Medium elemental, neutral evil
Armor Class 17
Hit Points 170 (20d8 + 80)
Speed 30 ft., fly 60 ft.
STR 18 (+4) DEX 18 (+4) CON 18 (+4) INT 26 (+8) WIS 24 (+7) CHA 26 (+8)
Saving Throws Con +10, Int +14, Wis +13
Skills Arcana +20
Damage Resistances damage from spells
Damage Immunities force, poison; non magical bludgeoning, piercing, and slashing
Condition Immunities charmed, exhaustion, frightened, poisoned
Senses truesight 120 ft., passive Perception 17
Languages Common, telepathy 120 ft.
Challenge 18 (20,000 xp)
Magic Resistance. The nephen has advantage on saving throws against spells and other magical effects.
Magic Weapons. The nephen's weapon attacks are magical.
Innate Spellcasting. The nephen's spellcasting ability is Intelligence (spell save DC 22). The nephen can innately cast the following spells, requiring no material components:
At will: counterspell, detect magic, dispel magic, invisibility, mage armor, shield
3/day each: cone of cold, fireball, hold monster, lightning bolt, telekinesis
Vulnerability to Spells A nephen suffers disadvantage on saves against effects that would banish or imprison it. A nephen that begins it turn in or moves into the presence of an antimagic field takes 10d8 points of damage. Dispel magic can be used offensively against a nephen, requiring a spell attack roll (with advantage) and dealing 8d6 points of damage if successful. (Plus 1d6 per level if used at higher levels.)
Multiattack. The nephen makes two attacks with its fists. It can substitute a force blast for any melee attack.
Fist. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) bludgeoning damage plus 22 (5d8) energy damage. The nephen determines the damage type, whether it is acid, cold, fire, force, lightning or thunder.
Force Blast. Ranged Spell Attack: +14 to hit, range 100 ft., one target. Hit: 22 (5d8) force damage.
Major Magic (Recharge: 6) The nephen casts a spell off the wizard list. If the spell is lesser magic (1st - 3rd circle), the nephen recharges on a roll of 5-6 and rolls two d6 taking the higher result. If the spell is greater magic (7th -9th circle), the nephen recharges on a roll of 6, and rolls two d6 taking the lower result.