You can cast this spell only at night. Choose a corpse of Medium humanoid within range. Each corpse becomes a ghast under your control. When you cast this spell, you must roll a DC 20 Constitution saving throw, taking 20d8 Necrotic Damage on a failure and half that on a success.
As a bonus action on each of your turns, you can mentally command any creature you animated with this spell if the creature is within 120 feet of you. You decide what action the creature will take and where it will move during its next turn, or you can issue a general command, such as to guard a particular chamber or corridor. If you issue no commands, the creature only defends itself against hostile creatures. Once given an order, the creature continues to follow it until its task is complete.
The creature is under your control permanently.
* - (one 5000gp black sapphire)
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Posted Apr 20, 2024Just a heads up, this is strictly worse then just upcasting Create Undead.
With a 9th level spell slot, Create Undead allows you to animated or reassert control over 3 ghasts. While this spell's ghast doesn't require the slot to keep reanimated it, it's definitely not suffering 20d8 necrotic damage to cast it. Especially at this level, where a CR 2 Ghast can be killed so easily by the level of enemies that the party will be facing.
Instead, I would take a page out of Create Magen's book, and have it still only create a single ghast, but it decreases your max hp by 2. Only a wish spell (or a Necromancy Wizard's immunity to hp reduction) can avoid/fix this reduction.