Soul Shield for Assassin late/end game PvE ?

[Elezen]

Which set should i use? and is there a better soul shield after those? (Like where should i farm) And what set should i "combine" with em? Critical/Evasion?  

PS: Someone told me there a Purple version of those Bloodshade are they better than the Purple of Blackram? 
PS2: What does Bo-Pae mean btw?