"Only 42 percent?" Erian involuntarily frowned. After all he had been through, his evolution process wasn't even half way completed yet. If this continues, it was unknown when he would actually be able to transplant the Blackfire gene successfully.
Thankfully, he had several evolution serums with him. Apart from the two he had bought previously, the loot from the vault also had three evolution serums. The evolution serums could increase the process by ten percent, reducing time effectively. But it had several side effect.
Firstly, ingesting the serum was insanely painful and after each use, the body would be in a state of fatigue for a few period of time.
Secondly, after each use, the effect of the serum reduces by 1 percent which meant the serum can only be used ten times and the effect would completely fade, no matter how much the person uses.
