Hmm I might spoil it for some who like a surprise, so best not read on if you want that.
Let me think how they do that on those other websites
***************** Warning Bedlam Spoiler*************************
Level 1: Boglings and Plague Spawn (the slimes)
Level 2: Bog things and Plague Beasts
Level 3: Plague Beast Lords and Interred Grizzles
Level 1 is a walk in the park with mages just casting EVs and Earthquake, I had my necro and was withering away franticly. For a warrior a good areadamaging wep I think. Tamers shouldn't have a problem.
Level 2 was a bit more annoying with the poisoning of the beasts, but casting EVs and areaspells did the trick nicely. The extra spawn both these creatures produce didn't form a big problem. (Bogthings produce Boglings and Plagues Beasts produce Plague Spawn, both minor easy targets).
The poisoning might be bit trouble on the warrior and the spawn they produce might mean a gang ganking up on you, but still some help by heals from mages and x-heals from others it shouldn't be a problem for most warriors.
Level 3 becomes a bit more tricky as they both take up some time to defeat so casting EVs on it will mean you have attack all the new ones popping up by offensive spells. And they don't fall easily so it's a bit of a pain if you have them following you. Best is to keep it occupied with a pet or summoned. And cast heal on pet and get some damage in as well.
For warriors it might be really nasty here with the Grizzled as they produce corrosive puddles if they get damaged alot, which are a real menace on any armor you are wearing. I noticed most my parts where under 10 when I gotten out of the place (but then again I am lazy at repairing so might be they been bit low allready, though I noticed someone else had low durability left as well after the fight).
I don't know what weapon/slayer would be best here.