The Concept Of Infinity.
Both the monk and Primordial Will frowned at Hal's words as it added to how much trepidation they felt as they were very much aware of what the creation of a Concept meant despite this being the first time it had ever happened.
They could see and feel that it was one part Order and one part Chaos which made it a constant production of the spark that had allowed creation to begin in the first place... but while Infinity was a combination of both Order and Chaos, it was also its own thing...
Having the potential to achieve feats that both Order and Chaos were currently incapable of.
What made it worse was that the two knew that it was because of their common use of Hal and his contact with both Order and Chaos that had made this possible.
To achieve what Hal just achieved required in-depth knowledge and know-how intro very make-up and creation of the three realms.