By Bismarck.Tragedie 2012-05-08 15:20:29
I did Den of Rancor (several times, once a long time ago when it was 16 min spawn, and more recently with 5 min respawn for 2nd character). BLM/RDM, stoneskin/phalanx,refresh, I'd start at SW area of first map (where the pool of water is), and pull slimes with sound aggro south down the ramp, stopping right before you get to where the millioneyes spawn. You'll get a few bats also but that's no big deal.
Solo I would manawall / sleepga, move to max range, restoneskin, -ga, and repeat... last time I did it I was dual boxing so I just had my 2nd char sleepga them as I ran by.
If you're going solo, you may want to start with a few less to see how it'll go... even if you only pull from that ramp, you'll still get 4-6 slimes.
If you're taking them out really quickly, you can go to the other ramp (leading back up toward map 1 if you run east past the millioneyes) for a few more slimes. This works well if you're only pulling 5 or 6 at a time and trying to avoid bats.
For similar trials, you can also get water and (rarely) fire weather here.
Hope this helps.