Terrible Experiment

He was born from a test tube, grown in a vat, and spent most of his life surrounded by glass and cryo fluid. He was the plaything of countless, unscrupulous experiments, which left him with scars, mental instability, and a bubbling hatred for his tormentors.

And then one day they let him simply walk out of the laboratory where he were constructed...But why?

He understands full English but speaks back in broken growls, he runs on all fours like a rabid animal and leaps high.

He has a respirator on his mouth, helping him to breathe in air, long black claws to tear his prey up.