Demon King:Perk system

Dave wakes up to find himself in a demonic city,it looks like he has been reincarnated in a different world,with a perk system in hand,lets see how far Dave can go ~~~~~~~~~~~~~~~~~~~~~~~~ I am a little bad on grammer as you will see or have seen from my previous novels,i quit because of university,i am back because i have a months free time and wanted to try my luck ,