Blood Sacrifice

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A silent resonance occurred when he started the process.

It is debatable if there is another person other than him who could sense this, and even if there was, they probably wouldn't feel this as intimately as Cedric does.

The arrays he instructed the House of Light to engrave on the other Leyline Roots were resonating with what's happening here.

Cedric's perception was completely immersed in the Leyline Network; he couldn't spare any attention to anything else other than this. That's why he asked for help since he's actually very vulnerable right now.

Nobody knows except him what he's actually doing to achieve this. They probably don't have any idea just how much of a of a burden this was for Cedric. If this were to be done normally, it would require at least hundreds of people to do so. In other words, Cedric was doing the work of too many people by himself.