After obtaining the new host, Zhang Yuan instantly invested ten thousand points of Source Material into the Golden-haired Rat.
The Storage Space's utility was immense, but its initial volume was truly too small, and he really wished he could upgrade it to full level at once.
However, what Zhang Yuan never expected was that the amount of Source Material needed for the Golden-haired Rat's evolution far exceeded his estimation.
For the first upgrade, it consumed as much as five thousand points of Source Material.
Upgrading to Level 3 used another ten thousand points!
Zhang Yuan simply poured all the remaining seven thousand plus points into it, barely increasing the evolution level to just a bit over one-third.
This meant that upgrading from Level 3 to Level 4 required a total of twenty thousand Source Material.
An increase by yet another fold!
