it actually only took me like 2 maybe 3 hours to get everything. i found to get soul of thasma you go and find the hunt ishteen steal it from him then go a few rooms away go back and steal some mroe from him and repeat the process without ever killing him.

hell gates flames are ususally dropped around the 1st-20th chain after that ive never seen one and i chanined over 100 without getting one.
same for the wargods band with leynir. everything else was rather easy to get.

i must say i love this weapon too i equipped the genji glove and got an 11hit combo of 9999 each swing on yiazmat.