Something's Not Right with My Battle Pet. It's Trying to Upgrade to Black.

My name is Lin Ze, and I have traveled to the world of global beast control. Here demons invade, humans can strengthen themselves by awakening their beast pets and becoming beast masters! I wanted to awaken my pet and become an ordinary person, but unexpectedly the system went black... "Your pet fox demon felt guilty because of your good looks. It turned completely black and automatically upgraded. It has broken through and become the nine-tailed demon fox Su Daji!" "Your pet ghost feels ashamed because of your hard work in cultivation. It has turned completely black. Its cultivation speed has increased a hundred times and it has become the Son of Yin Tianzi!" "Your weapon, the Blood-Breaking Sword, was deemed too ordinary to be worthy of you. It automatically turned black and swallowed demons. It has mutated into an emperor-level demon-slaying sword!" Lin Ze: "???!!" Lin Ze: "Is this even possible!?" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.