Eidolon

Description
This semi-unique creature is a bizarre looking mismatch that resembles a floating octopus. It is found only in a couple of areas, and its essence is used to infuse armor by the various Seers. It is labeled by the Seers as being a malevolent creature, but no one knows where the Seers stand to begin with.

Location
Found in Iron Mines of Moladune, Ring of Fire (if you take the bonus) and Abaddon's Mouth

You can find a creature similar to the Eidolon, also dropping a spectral essence, in the Mineral Springs

Items Dropped

 * Spectral Essence

Bosses

 * Himself