A 10-foot-radius invisible sphere surrounds you. Within the sphere, spells can't be cast, summoned creatures disappear, and magic items become normal. The sphere moves with you. Summoned creatures re-appear once the sphere leaves their space, and magic items are restored upon being removed from the sphere.
Magical effects, except those created by an artifact or a deity, are suppressed in the sphere and can't enter or affect things within it. A slot expended to cast a suppressed spell is consumed. While an effect is suppressed, it doesn't function, but the time it spends suppressed counts against its duration.
The sphere cannot be dispelled by magic, nor can two antimagic fields suppress each other.