Well I don't know 100% but chances are, you'll be seeing a lot of people using S/R upgraded broadswords and falcata's. Although I'm not sure if somehow artisan on war sword makes up for the lack of S/R, I doubt it does but Archibald makes me wonder a little bit. - If you have spike broads, get them gem upgraded and 100 prof for S/R :)
Yes you can get war swords from jousting. I can't recall the price but I think they're around the same amount of pts as the armor. Maybe 150? This is just an educated guess though. I'm guessing they're probably base stat too.
Viscount is obtained from 51+ stars on ballooning, however the ego-swap glitch for rewards is fixed. So it might take a handful of runs lol Still, doable in a days grind probably as they raise the "drop rate" for rarer items to compensate for the lack of the ego-swap glitch. (Compensation for lack of a gltich.. funny)
Oblivion is obtained from the giant gnu that spawn daily in Karu. 3 spawn at a time, I don't know the drop-rate of oblivion. But that's 21 gnu's a day and EVERYONE and their mother is going to be camping those poor gnu's. Chances are, you'll have to either buy the ES or get hardcore about that field boss. Then again, not many people will want to sell them unless they are consistently getting them.
Obtainable within a month? If you farm the balloons and buy the oblivion, probably so. If you field boss hunt for the oblivion, it's questionable. (I don't have enough info on the droprate)
Thanks for the response. Looked up Oblivion and just gunna keep my Fleet Ravens, not wanting to sacrifice 5 crit and 4 min damage for 1 more max damage and 3 def.