Aegis

Aegis is a hardmode post plantera accessory. It has a chance of dropping from the boss Jove. This accessory has a 10% chance to inflict stoned upon enemies for 3 secs. It also provides extra 4 defense. It looks like a lare silvery shield with a Medusa Head on front.

Trivia

 * The shield is of course a reference to Mirvana's or Athena's shield Aegis.