Stench. Constitution Saving Throw: DC 13, any creature that starts its turn in a 5-foot Emanation originating from the ghast. Failure: The target has the Poisoned condition until the start of its next turn. Success: The target is immune to this ghast's Stench for 24 hours.
Multiattack. The ghast makes two Horrific Necrosis attacks. It can replace one attack with a Claw attack.
Claw. Melee Attack Roll: +6, reach 5 ft. Hit: 13 (3d6 + 3) Slashing damage. If the target isn't an Undead, it has the Paralyzed condition until the end of its next turn.
Horrific Necrosis. Melee or Ranged Attack Roll: +7, reach 5 ft. or range 120 ft. Hit: 15 (2d10 + 4) Necrotic damage, and the target has the Frightened condition until the end of its next turn.
Spellcasting. The ghast casts one of the following spells, requiring no Material components and using Intelligence as the spellcasting ability:
At will: Speak with Dead, Thaumaturgy