Weight: ½ lb.
Estimated Value (Sane Cost Guide): 500 gp
DMG Value: 101 gp - 500 gp

A mind crystal contains sorcerous potential, allowing a user to apply Metamagic to a spell as you cast it. For the non-sorcerers among us, Metamagic allows you to tweak and alter a spell to better suit your needs, such as extending its duration or increasing its range. While Metamagic is a sorcerer class feature that needs sorcery points to use, mind crystals are single-use items that can be used by anyone who can cast a spell.

An extended Mind Crystal doubles the duration of a spell that already has a duration of 1 minute or longer, up to a maximum of 24 hours. Encounters rarely last longer than 30 seconds, so these will only be beneficial for combat spells if your party is moving quickly from room to room in a dungeon. For this reason, an extended mind crystal is often best suited for utility or exploration spells, or spells you might use on a heist.

Spell suggestions: charm person, death ward, disguise self, enhance ability, invisibility, mage armor, pass without trace, polymorph, suggestion

FAQ: Mind Crystals

Can I use a mind crystal on spells with any casting time?
No. Mind crystals can only be used on spells with a casting time of 1 action.

Can I use more than one mind crystal on the same spell? Or if I'm a sorcerer, can I use a mind crystal and my own Metamagic on the same spell?
No. Spells can only be bent so far before they break; one Metamagic only, please. Sorcerers can apply Empowered Spell or Seeking Spell to a spell already modified by Metamagic, but that exception doesn’t apply to mind crystals. (Look what they need to mimic a fraction of your power.)

If the spell fails, is the mind crystal's magic consumed?
Yes. Spell failure doesn’t mean you didn’t spend the resources trying. Just ask disintegrate.

Source: Phandelver and Below: The Shattered Obelisk

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