Fragmented Mind

Fragmented Mind is an Expert Mode-exclusive accessory dropped from Brain of Cthulhu when defeated in the Etherial Dimension. When in the Etherial, if the player is dealt contact damage by an enemy, that enemy takes 50% more damage for 15 seconds. Additionally, if the player takes a lethal hit from contact damage, that damage is prevented, the player is instead healed for 300 life, and both abilities enter a 3-minute cooldown.

The player becomes immune for two seconds, healed for 300 hp, and gets the debuff Fragmented Mind.