If I was a 17th level Warlock using Mystic Arcanum to casting Imprisonment, can you use 3rd level Sorcerer Metamagic Heightened Spell to give opponent disadvantage to their WIS saving throw?
Can your Arcanum spell be manipulated by Metamagic?
I'd say yes. Metamagic can be applied when a sorcerer casts a spell and Arcanums grant the ability to the warlock to cast a particular spell 1/day without using a spell slot. The only limitation is that you would need at least 3 sorcery points to heighten a spell and the effect only applies to one target of the spell.
Mystic Arcanum doesn't eat a spell slot, but it still says that you "cast" the spell. It the same as if you want to use Heightened Spell with a spell you learned via a racial trait, the Magic Initiate feat, etc.
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I tried to do a search but had no luck.
If I was a 17th level Warlock using Mystic Arcanum to casting Imprisonment, can you use 3rd level Sorcerer Metamagic Heightened Spell to give opponent disadvantage to their WIS saving throw?
Can your Arcanum spell be manipulated by Metamagic?
I'd say yes. Metamagic can be applied when a sorcerer casts a spell and Arcanums grant the ability to the warlock to cast a particular spell 1/day without using a spell slot. The only limitation is that you would need at least 3 sorcery points to heighten a spell and the effect only applies to one target of the spell.
Mystic Arcanum doesn't eat a spell slot, but it still says that you "cast" the spell. It the same as if you want to use Heightened Spell with a spell you learned via a racial trait, the Magic Initiate feat, etc.