Magic Item of Constant Protection from Evil

[Nail]

“Mental control” includes all spells of the school of
Enchantment that have the Charm subschool, such as animal
friendship, charm person, and charm monster. .....

Huh. That 1st level spell is way too good.

Context: My player's PCs last night really enjoyed the "protection from charming" part.

However, the little blue faeries that charmed the PCs were still the PC's friends....the faeries just couldn't order them around with opposed Cha checks.

Which was very disappointing, from an evil-DM stand-point.