Wait, what? Hexx Ruins? I meant Gorgon Class by beating Naga City...
Sorry, though you meant the trophy.
Personally, so long as JJ gnomes remain around, I don't think Naga City is any more difficult than Dragon Isles to get your 3-class victory.
AA's... I quit
Agreed; five AA's = 50 layers of death protection. PISORF with rock heart is the only thing with a chance of breaking through that.
I died against AA twice, once against Wraiths and once against those resist lowering slimes from slime pit.
Okay, now there's lowers resist
enemies as well!? Well, there goes any resistance strategy as a viable approach.
It seems to me that only remote possibility for victory is the Vampire. You'd somehow need to boost your damage abd lifesteal into the 90's though and also get the BLUDTUPOWA glyph to fuel spellcasting and probably would also need PISORF to deal with the AA's (knock them into each other; four mana to knock out two death protections).
Without preps, that's borderline impossible. Trisword/Keg of Health is the only combo that will raise your base attack enough to achieve this, and that will require an early gloves of midas find, and on top of this you need to conserve your monsters on the top level carefully. On top of this, without the RBS your ability to deal with physical resist enemies is thoroughly gimped, and you won't have enough spellcasting resources to deal with them all.
On the plus side, such a character would probably be impervious to Horatio's low damage output, so you wouldn't suffer too much from the loss of WHUPAZ.