Jade-Lich Idol

 is a unique item in Outward.

Description
"Effigy of a ancient undead mage. The statue's underside has grooves that might fit on some device."

Usage
Used to unlock the Ziggurat Passage, to activate a bridge to the south-eastern area of Hallowed Marsh (see Strange Apparitions)

Acquired From
 can be found in Ziggurat Passage. See the location page for more details.