Spell Twister

Description
Reflecting the desires of the Soul Sanctum for mastery over SOUL, it improves the bearer's ability to cast spells.

Reduces the SOUL cost of casting spells.

How to Acquire
A secret room on the top of the Soul Sanctum, just before fighting Soul Master.

Usefulness
This is an incredibly useful charm for a Spell build, as unlike using Soul Catcher or Soul Eater, the player will not need to attack with the Nail as often to regain Soul, and unlike using Grubsong, the player does not have to be dependent on taking damage to have consistent soul.

Of course, combining any of these charms will provide a much more powerful boost to Soul management than only using one.