Mod of Redemption/Ancient Core

The Ancient Core is a Pre-Hardmode. When equipped, it grants 5% increased mining speed, an aura of light and boosts to all stats as well as vision while in Underground. However, your vision is reduced and you will slowly lose life on surface.

Trivia

 * This accessory, as it suggests, is an accessory essential for underground expeditions. So, equip it whenever you go underground to get all boosts granted.