As for your second best stat with this build, we recommend Wisdom. This further boosts your Stealth and will give you more of an advantage of sneaking past without being seen, and thus more than enough time to plunge your dagger in your enemy’s unsuspecting back. If you’re looking to be a thief in the night, then the best thing you can do is put most of your points into your Dexterity.
Again, it ultimately depends on what you want your Rogue to be like… When you think of a Rogue, you may easily fall into the line of thinking that ‘oh, I need to be stealthy for this class.’ And while that is somewhat true, you do get more damage with sneak attacks, after all, it isn’t the only thing a Rogue can focus on.