Varian tried to just read everything. But the soul of the god was different from living beings.
Even with the power of a rank 2, Varian couldn't just read away the memories.
Of course, he could try to brute force his way through. But that risked collapsing the entire memory and destroying the soul before anything valuable could be obtained.
So, Varian started by checking the memories of every day. Thanks to his enormous soul power, he could check the memory of a millions years in an instant.
So, even though there was memory of billions of years, he quickly progressed.
The older the memory, the harder it was to get started. Varian started from the newest.
The dead god stayed in this sealed area of the forbidden region for billions of years.
No one came here ever. Not a single soul.
Soon, Varian dialed back, reaching the first 100 millions of the forbidden region's creation. This was as ancient as history could get.