Everyone spent a couple of years together. Gravis hadn't visited his parents in quite some time, and he wanted to spend more time with them.
After several years, Gravis and Mortis decided to continue. They wanted to see their friends and other family again, but as long as the Peak Sects were still hunting them, they couldn't visit them.
Because of that, they needed to become more powerful very quickly.
The Economistress assured them that she would inform their friends that Gravis and Mortis were fine and that they would take a while. They only had to focus on their Laws.
Gravis felt deeply grateful towards his mother. She had essentially given Gravis six trillion God Stones as a present since she was using the fruits to help Gravis' and Mortis' close ones.
Six trillion God Stones was an incredibly valuable gift.
After planning their future, Gravis and Mortis increased their Realm with their newfound wealth.