Spell Twister

Spell Twister is a Charm in Hollow Knight. It reduces the amount of SOUL required to cast Spells.

Usefulness
This charm stacks well with charms that generate SOUL, like Soul Catcher or Grubsong, as it uses SOUL more efficiently instead of generating it. It is also much more efficient than Soul Catcher in terms of nail hits per spell; of course, this comes at the drawback of not being able to use this added efficiency on Focus.

This charm can also be used in some advanced skips as it lets you use 4 spells in a short time instead of only 3.

How to Acquire
A secret room on the top of the Soul Sanctum, just before fighting Soul Master. The room which leads up to it is filled with Mistakes and Follies which can make reaching the Charm nearly impossible without taking damage as these enemies may spawn right onto the Knight.

The charm itself is found attached to some sort of machine similar to the Lore Tablets found around the area.

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