Where do I drop...?

Treasure Key (59998)
Treasure Key Upgrade item for Beril accessories. Source: Nephrite bosses and Frostbane Dungeon. [Click for details]	Crafted at NPC: Guardian Nephrite Chest [Click for details] Nephrite Chest x3 10,000,000,000 Yang Dropped by: Endbringer (Level 100) x2 ~70% HP 40,000,000 Strong against Undead Power of Darkness Cathedral zombie (Level 100) x2 ~70% HP 40,000,000 Strong against Undead Power of Darkness Vampire lord (Level 100) x2 ~70% HP 40,000,000 Strong against Undead Power of Darkness