Crone of the Murk

Murk Shroud. The Crone is heavily obscured unless a creature is within 10 feet of her. Additionally, creatures in dim light have disadvantage on attack rolls against her.

Amphibious. The Crone can breathe air and water.

False Form. The Crone can cast disguise self at will without expending a spell slot, always appearing as a beautiful, sorrowful maiden or kindly matron.

Rotting Touch. Melee Spell Attack: +7 to hit, reach 5 ft., one creature. Hit: 14 (3d6 + 4) necrotic damage. The target's AC is reduced by 1 for 1 minute (stacking up to -3). This effect ends early if the target receives magical healing.

Truth Unspoken (Recharge 5–6). The Crone whispers a forbidden truth to a creature within 60 feet. That creature must succeed on a DC 18 Wisdom saving throw or take 21 (6d6) psychic damage and suffer short-term madness for 1 minute (save ends at end of each turn).

Illusory Mire (1/day). The Crone creates a 30-foot-radius swampy illusion centered on herself. Terrain in the area becomes difficult terrain, and all creatures of her choice are heavily obscured from enemies while inside it. Lasts 1 minute (concentration).

Fade Into Murk. The Crone becomes invisible until the start of her next turn or until she attacks or casts a spell.

Whisper of Rot. A creature within 30 feet must succeed on a DC 15 Constitution saving throw or take 7 (2d6) necrotic damage and lose 10 feet of movement until the end of its next turn.

Illusionary Lure (Costs 2 Actions). The Crone casts phantasmal force without a spell slot or components.