Gravis spent the next 200 years just being underground. He still had over 150 years left until Siral's tribulation, which was more than enough to make his way back.
Why did Gravis wait for so long?
It was important that Gravis faded from everyone's memory. Yes, they might still remember him, but inside their mind, they would have already accepted that they would never see Gravis again.
During these 200 years, Gravis experimented on his own body. Comprehending the Composition of his body was unnecessary since his body was composed of Punishment Lightning. However, he could still learn some general processes that would also be in place for a body that was not composed of Punishment Lightning.
Gravis had also been slowly moving away from his previous location in these 200 years. By now, he was nowhere near his old location anymore.
SHING!
Gravis came out of the ground for the first time in 200 years and looked around.
Forest.
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