Mana and Nether?

Liam froze for a second as his figure trembled in shock. Just how big was this array and what was the purpose of such a powerful array formation. His mind raced as he thought about the possibilities.

The next instant, the image he saw disappeared and only a few of the nether lines were in place. "So it has not yet happened?"

He tried to perceive the nodes and lines of the array again but a searing pain interrupted him. Groaning, he stopped trying to get the full picture of the array.

The array formation was a massive network, spanning the whole world. So instead of trying to forcefully sense everything, he simply sensed the nodes in place in the territory he was currently standing.

This was easier and he was immediately able to discern about twenty nodes. 

Each nether line connecting these nodes glowed with a distinct shade of black, indicating different intensities and characteristics of the nether energy they carried.