Bloodflare Core

The Bloodflare Core is a post-Moon Lord accessory exclusive to Expert Mode. It is obtained from the Ravager's Treasure Bag after defeating Providence, the Profaned Goddess. While equipped, all damage taken will temporarily reduce the player's defense. The amount of defense lost depends on how much damage was taken up to 50% of the player's max defense. Over time, defense will regenerate at 40 defense points per second. Each time the player regains a defense point, they are healed for 1 HP.

Trivia

 * This accessory previously tailored to low defense builds before being reworked into the opposite.