[RPG] Does a warlock require material components for a Mystic Arcanum spell

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The description in the Warlock class says only:

At 11th level, your patron bestows upon you a magical secret called an arcanum. Choose one 6th-level spell from the warlock spell list as this arcanum.
You can cast your arcanum spell once without expending a spell slot. You must finish a long rest before you can do so again.

It says nothing about having or needing the material components for the Mystic Arcanum spells. This becomes very important for spells such as Forcecage or Plane Shift.

Best Answer

Mystic Arcanum only excuses the spell slot requirement.

Mystic Arcanum states:

At 11th level, your patron bestows upon you a magical secret called an arcanum. Choose one 6th-level spell from the warlock spell list as this arcanum. You can cast your arcanum spell once without expending a spell slot. You must finish a long rest before you can do so again.

Notably, we are still casting the spell, so any requirements for casting the spell that are not excused by the feature still apply:

A spell's components are the physical requirements you must meet in order to cast it.

You don’t expend a spell slot, but you still need to fulfill any and all component requirements.

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