Vampiric Eye

The Vampiric Eye is a Hardmode, post-Golem crafting material dropped by Vampires with a drop chance similar to broken bat wings during the solar eclipse event. This material is used to craft the Vampire Flask, Scythe of Legion, and Dracula's Scepter.

Dropped by

 * Vampire - from Solar Eclipse event (2.5% / drop chance)

Extra quote
"The eye of the vampire, a disgusting but powerful artifact that senses all the blood there is to devour."