Shaman Stone

Shaman Stone is a Charm in Hollow Knight. It increases the damage of Spells and the size of Vengeful Spirit/Shade Soul.

Usefulness
Since it increases Spell damage by 33-51% depending on the Spell, it is incredibly powerful, as it can be used to one-shot many enemies from safe ranges, or to deal more Spell damage to bosses.

Shaman Stone is incredibly useful for speedrunning, not only because of the damage boost it gives to Spells, but also because of how fast and easy it is to acquire compared to other damage sources like Fragile Strength, Quick Slash, or Pale Ore.

How to Acquire
Bought from Salubra for in the Forgotten Crossroads.
 * Shop description:
 * Are you a spellcaster, you little scoundrel? Ho ho! I'm only teasing. If you ever learn any spells you should buy this charm for yourself. I've heard it will make a spell much stronger!