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Memory Crystal is a Blue tool that you can equip to your crest in Hollow Knight: Silksong. Check out how to get Memory Crystal, its location, and its effects here!
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To find the Memory Crystal, head to Mount Fay and make your way to the bench in the bottom-left corner. Resting here also provides a hint about the area’s secret location!

Once you reach the bench, break the wall to your right to reveal a secret path. Follow it and break any ice along the way until you reach a large room at the end. Break the giant ice crystal there, and it will drop the Memory Crystal for you to pick up

The Memory Crystal summons a crystal when you take damage from enemies. This crystal will then shatter when struck by an enemy, inflicting damage on contact.
It’s a great tool to equip against bosses that frequently charge at you!
You can find this in a hidden room to the right of the bench in west Mount Fey.