While Gravis was concentrating on creating Weapon Techniques, Mortis left Arc's clearing and went towards the beast territory. Mortis wanted to comprehend the Soft Pure Law as quickly as possible so that Gravis and he could concentrate on the Hard Complex Law. Like this, Gravis' weapon wouldn't be in danger anymore, and Mortis also wouldn't need to use up as many weapons.
Mortis entered the ground and went down as far as possible. He managed to dive deeper than 90,000 kilometers since he was now a Major Circulation Immortal King.
Mortis was using the Law of Graphite's Gravity and the Law of Inferno's Heat to protect himself from the heat and gravity down there. Mortis preferred using lightning, but that didn't mean he couldn't also use all the other Laws Gravis and he knew.
After a couple of days, Mortis arrived in front of the root network and stopped before it.