You can only buy the solus greatsword from bowerstone north.

WEre you bad or good?

it's easy just u have to gain multi arrow and master bow use the multi arrow then shoot on
him tats all

You use berserk over and over again, all the while beating the crap out of him with a mace
or good sword. An ax works pretty well too, I think. Idk, I've played this game a lot and
the best weapon I've used on him was the doll mace.