If the value of this Iron Armor Cow's scales was around five million, then the value of this Cow Gallstone should be at least ten million or even more.
A cow with a Cow Gallstone has the potential to advance to a higher level. For instance, bovine Mutated Beasts might evolve into Iron Armor Cows or Unicorns, but these are actually different species mutated from an ordinary cow.
Aside from the African Buffalo or Rhinoceros that could advance to B-level, these ordinary cows couldn't advance to B-level unless they have a Cow Gallstone.
No wonder this cow grew so big. If it were given some more time, it might have become a B-level beast. Unfortunately, before it could reach B-level, it was killed by Lin Zhen, and the Cow Gallstone became Lin Zhen's trophy.
Happy to collect the Cow Gallstone, Lin Zhen felt extremely delighted to receive a loot worth over 20 million after killing a C-level beast.