PREVIEW
... Cain was petting Nix gently as he didn't expect that he would be able to upgrade Nix's rank again this fast.
"Are you ready, Nix?" Cain asked with a smile.
"Roar!"
Nix answered with a roar as he was also excited that he would become stronger again.
"System, upgrade Nix's rank to the Rank 5 Beast!" Cain ordered as he stepped back to stay away from Nix.
[Ding! Do you want to upgrade Nix's rank to Platinum Rank Beast?]
"Yes," Cain confirmed with a no ...
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