On your travels you come across an anti magic grimoire inside and depending on your physical power it will allow you to draw one of its three swords. When you pick up this book you are filled with antimagic energy however once this energy is absorbed you cannot cast any spells yourself as the magical energy will be destroyed by the antimagic.   

Grimoire

This book supplies you with Antimagic and holds the anti magic swords you can use. This book is next to indestructible is cannot be burned, damaged by water, or cut by any conventional weapon, it also is invulnerable to any magic.  

Demon Slayer Sword

You gain the ability to draw the demon slayer sword from your grimoire, this is a large broadsword and can be used as an attacking weapon or a defensive weapon. Using its broad end you can deflect magical attacks. 

Antimagic

The antimagic coursing through your veins can stop a spell effect. 

Demon Dweller Sword

The demon dweller sword is a light finesse weapon the uses dexterity as its modifier it can also perform a ranged anti magic weapon attack.  

Demon Destroyer Sword

This sword is a longsword or heavy weapon it deals 1d8+str mod damage. 

Telepathic Link

You can now control the Demon Slayer Sword with your mind. 

Demon Mode

You coat yourself in anti magic energies giving you a higher armor class and better attacks.