Phaerimm Elder

Huge Aberration, Neutral Evil

STR
18 (+4)
DEX
16 (+3)
CON
17 (+3)
INT
17 (+3)
WIS
16 (+3)
CHA
18 (+4)
Magic Resistance.

The phaerimm has Advantage on saving throws against spells and other magical effects.

Spellcasting.

The phaerimm casts one of the following spells, requiring no spell components and using Charisma as the spellcasting ability (spell save DC 17):

At will: Command (level 3 version), Detect Magic, Detect Thoughts, Mage Hand

1/day each: Clairvoyance, Geas, Major Image, Mirage Arcane

Protective Magic (3/Day).

The phaerimm casts Counterspell or Shield in response to the spell's trigger, using the same spellcasting ability as Spellcasting.

3/day: Counterspell, Shield

Actions

Multiattack.

The phaerimm makes three Mind Lash attacks. It can replace one attack with either (A) a Vicious Stinger attack or (B) a use of Spellcasting to cast Command (level 3 version).

Mind Lash.

Melee or Ranged Attack Roll: +9, reach 10 ft. or range 120 ft. Hit: 32 (6d8 + 4) Psychic damage.

Vicious Stinger.

Melee Attack Roll: +9, reach 5 ft. Hit: 11 (2d6 + 4) Piercing damage plus 26 (4d12) Poison damage, and the target's Speed is reduced to 0 feet until the start of the phaerimm's next turn.

Siphon Magic (Recharge 5-6).

The phaerimm focuses on a magic item it can see within 10 feet. When it does, the phaerimm drains the magic item of any charges. Regardless of whether charges are drained, the phaerimm can cast Clairvoyance, Geas, Major Image, and Mirage Arcane one additional time that day.

Bonus Actions

Teleport.

The phaerimm teleports up to 30 feet to an unoccupied space it can see.

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Phaerimm Elder

Source: Netheril's Fall - Licenses and attribution