Current 80%+ Affinity Great Sword Build
Build picture at end of video. The main keys here are an Artian GS with 30% Affinity, then Critical Eye 5 for another 20% and Maximum Might 3 for another 30%.(When stamina is full) I have Weakness Exploit 4 for the remaining 20% Affinity but that's just a preference for me. Obviously anything else can be interchanged for whatever you see fit. Critical Boost would be a great addition if you could find a way to fit it in there.