This build is all about popping BMB and two handing. The dark hand is a last resort shield which will save you from a couple of big hits. It blocks 80% on everything but only has 30 stability so get ready for a ton of stamina loss. Blocking with the claymore isn't really recommended due to it only having 60% physical but the 38 stability might help a bit. DMB and Falchion is a deadly combination. It will break poise very quickly and it does a lot of damage even through shields. The idea fully came from Oroboro so all credit to him. Alternatively, you can DMB the claymore but this isn't the best Idea because it's not as fast so buff damage is all about DPS. Doing 3 falchion hits will do a ton of damage if they all connect. Using the claymore two handed you'll only get one or two hit in in the same amount of time and the buff damage won't be as good.
Good luck fellow invaders!