Herald Void Neuron預言者の空虚の神経細胞

A glowing cell that phases through itself, twisted and pulled as if tethered to an unseen presence. Once part of S.A.H.A.B.A.R.'s containment core, it now transmits a distorted echo of the same signal.
In-game description

What is Herald Void Neuron? Features and uses

Herald Void Neuron is an epic item in Core Keeper (Materials).

Herald Void Neuron key points (from the game data)

Sells to merchants for 16 Ancient Coins.

Calculated and summarized by this site from the game data (1.3.0.6).

Herald Void Neuron notes

It goes into the single slot at the entrance of the excavation site's drill.
Once inserted it is locked in and cannot be removed.
There is nothing to fill on the giant drill itself: no inventory and no fuel.
Just carrying the neuron within 7 tiles of a Pious Caveling Monument alters the monument's appearance; the neuron is not consumed.
If you want to change nearby monuments, do it before you put the neuron into the entrance.

These notes cover behavior that the game files do not show directly. They are based on facts from the Core Keeper Wiki (Fandom) page "Herald Void Neuron" (CC BY-SA 3.0), rewritten in this site's own words.

How to get Herald Void Neuron

Defeating S.A.H.A.B.A.R. always drops it (1)

Scene containers, dungeon placements, guaranteed drops and natural spawns are based on the Obtaining data of the Core Keeper Wiki (Fandom) (CC BY-SA 3.0), because these are not in the game files this site reads. Scene names are the wiki's English names.