Zero One is a portal that sucks Fugil into an alternate dimension where time is always stopped. The transfer takes one second, but during that second, Fugil escencially becomes untouchable, as any attack launched will be sucked and any physical attack will transport the one who attacked into said dimension.
I will explain it using character names, taking the example straight from Volume 15 of the novel.
Soffice used Mahapurana (vector manip) on Fugil to change his trajectory and thus make his attacks fail. However, vectors don't have as much mass as water, thus Mahapurana didn't work and Fugil's trajectory couldn't be changed.
Magialca launched an energy blast towards Fugil, but since energy doesn't have as much mass as water. it didn't work.
Singlen can manip water, so he launched water slashes towards Fugil, and they worked since water has the minimum amount of mass needed to affect him.
I mean, Fugil with his passive Info Analysis can know his opponent's spec, equipment and abilities, so Fugil can think "this guy can manip my molecules, I create a law to null that" and Adam doesn't have enough range to reach Fugil before he gets into Zero One.