Arch-hag

Traits

Legendary Resistance (4/Day, or 5/Day in Lair)

If the hag fails a saving throw, it can choose to succeed instead.

Magic Resistance

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

Spiteful Escape

When the hag drops to 0 Hit Points, it dies only if it is within 30 feet of its anathema (a thing the DM chooses as the hag's most hated thing). Otherwise, the hag drops to 1 Hit Point and teleports to a harmless demiplane, and it can't return to the plane it left for 2d6 days. When the hag teleports away, each creature within 60 feet of the space it left is cursed. Until the curse ends, a creature has Disadvantage on ability checks and saving throws, and the hag knows its location anywhere in the multiverse.

Actions

Multiattack

The hag makes two Spectral Claw attacks and uses Crackling Wave.

Spectral Claw

Melee Ranged Attack: +14, reach 10 ft. or range 60 ft. Hit: 17 (3d6 + 7) Force damage. If the target is a Large or smaller creature, it has the Prone condition.

Crackling Wave

Dexterity Saving Throw: DC 22, each creature in a 60-foot Cone. Failure: 32 (5d12) Lightning damage. Success: Half damage. Success or Failure: The target is cursed until the end of the hag's next turn. The target can't take Reactions until the curse ends.

Bonus actions

Witch Strike

Each creature cursed by the hag and within 60 feet of it takes 14 (4d6) Lightning damage.

Legendary action uses: 3 (4 in its lair). The creature can use one option at the end of another creature’s turn and regains spent uses at the start of its turn.

Legendary actions

Hag's Swipe

The hag makes one Spectral Claw attack.

Malicious Magic

The hag uses Spellcasting to cast Dimension Door or Hypnotic Pattern. The hag can't take this action again until the start of its next turn.

Coven Magic

While within 30 feet of at least two hag allies, the hag can cast one of the following spells, requiring no Material components, using the spell's normal casting time, and using Intelligence as the spellcasting ability (spell save DC 19): Augury, Find Familiar, Identify, Locate Object, Scrying, or Unseen Servant. The hag must finish a Long Rest before using this trait to cast that spell again.

Spellcasting

The hag casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 22):

At will: Detect Thoughts, Dimension Door, Dispel Magic, Hypnotic Pattern

2/day each: Mass Suggestion, Modify Memory, Plane Shift

Tongue Twister

The hag casts Counterspell in response to that spell's trigger, using the same spellcasting ability as Spellcasting. If the target fails its saving throw, it is cursed until the end of its next turn. Until the curse ends, the target can't cast spells with a Verbal component, and when it speaks, it says the opposite of what it means.

At will: Counterspell

Regional effects

The region containing an arch-hag's lair is altered by its presence, creating the following effects:

• Lapsus Linguae: Creatures (excluding the hag and its allies) within 1 mile of the lair subtract 1d10 from any ability check they make when they take the Influence action.
• Meddlesome Magic: Whenever a creature other than the hag or its allies finishes a Long Rest while within 1 mile of the lair, the next time that creature casts a spell using a spell slot, it also casts Confusion centered on itself. The spell uses the creature's spellcasting ability and doesn't require Concentration.

If the arch-hag is destroyed or moves its lair elsewhere, these effects end immediately.