Someone mentioned to get a leo ring in my original build which makes sense since the Pierce Shield is a piercing weapon (facepalm). Also, I min./max.'d the excrement out of it so it's still a SL 100 build. I added some roll damage (Helm of Thorns) and stacked 50 poise.
The Grass Crest Shield is mainly for the Stamina Boost and you can parry BUT you can't reposte so it isn't really worth the risk of parrying IMO. (I obviously suck at parrying otherwise I wouldn't be desperate enought to make a Pierce Shield build, but don't tell anyone).
You won't win a Fashion Souls Award neither but maybe some duels or even do some gank spanks with it. (Don't even think about it...)
And now for the most important part. DON'T FORGET TO PUT A STAT POINT INTO RESISTANCE FOR THE HIPSTER ASPECT OF THIS BUILD!