Void Locus

 is a Hidden Realm Environment introduced in Survivors of the Void, accessible through the Void Portal after breaching all 9 cells in the Void Fields. It contains many Void Potentials and Cradles in place of chests, and is inhabited by Void monsters.

Deep Void Signal
The Void Locus contains 4 Deep Void Signals, which act similar to the Cells in the Void Fields. Once activated, they charge whilst creating a protective bubble from the void which forms after activation, spawning enemies to fight. Once all four are charged, another Void Portal will form near the top of the Hidden Realm, leading to The Planetarium.