Circlet of Iron Will

The Crown of Iron Will is a magic crown given to Neia Baraja by Ainz Ooal Gown.

Abilities
The crown defended the mind against charm, fear and other such mental attacks. Still, while the crown rendered one immune to magical attacks, it could only strengthen the wearer’s resistance against attacks derived from special abilities.

Trivia

 * Another thing to note was that the crown would also negate positive magical effects.