[quote=@Kimono]
could someone explain this corruption aspect for me? like...wat exactly, is this corruption portion?
[/quote]

Your character is part of:

"The Shades of Black is the name for the unofficial team led by Ozpin.  They are Beacon students charged with the task of keeping the peace in the world of Remnant.  Armed with rare-dust and experimental Grimm DNA infused in their bodies, they are a unique counter-measure force that hunts down the most dangerous and well-hidden threats."

Due to the dust and Grimm infusion, you have gained power at the expense of some form of corruption. This is some sort of physical or psychological anomaly that is a side effect of the experiments. The corruption also grants you, basically, a second Semblance or power of some sort. So, the experiments make you stronger but also warp you in some way. That is your Corruption.