From Ars Magica
In Ars Magica, a Nexus is a special entity that collects Raw Essence from various sources in order to power nearby Blocks. It is created by constructing pillars around a chalk circle on the ground. There are a few types:
- A Dark Nexus kills nearby creatures to build essence.
- A Light Nexus slowly draws essence from the environment without additional inputs.
- An Essence Nexus turns items into raw essence.
Having multiple Nexi within range of a machine may cause it to not be connected. I was unable to fix this with a wrench, eventually just moved the machine so it was only in range of one Nexus.