... are reputed to give the good items.So in the swamp:
Shadows or Lich give nice stuff like spd/dex rings
Goblins/Gremlins give some "attack potions" which are nice to import in CDS cause the begining is tough.
The various elven archer give great bows and all the arrow types - Peacemaker anyone?
Dinosaurs are supposed to give good stuff too, but you encounter very few of them (I met 3 in all, didn't get anything). I'm not talking about the conjured "Horastmus" but from "Tiranausaurus" (or something).
In the temple:
The toughest of each type usually have nice goodies:
Samurais (Lord Daimyo) have Tora maedate (AC-2,Vit 1) and Mampo of Death (AC-3,KAR 3)
Ninjas (Gandfather) have medicine bag and midnight cloak (both suck).
Knights (don't remmber) have every piece of silver/plate armor and blade cuisinart (nothing really exeptional)
Psionics (guardian of crystal) give PK crystal which is reg 2,AC-4,mental90%,INT 1 but for psionic ONLY (I had a faery psionic just for this item, as it imports in CDS)
G.Demons and Pit Fiends can give anything but as the range of item they have is broad, the probability to get something real good is real small. I have received books of magic, rings (spd,dex,lynx,mystic,...), many standard weapons/armor and some goodies:
Glass Slippers -8 Female only, Mental 99%
Demons Tooth 3 3D4 4 Thief only
Saint Bastard 2 2D4 5 Fig/Val/Lor
Sword Of Hearts 2 1D7 4 Thief/Bard/Rang
Diamond Eyes 2 3D4 4 Fig/Pri/Val/Bish/Lord (great secondary weapon)
Faust Halberd 2 4D4 2 Fig/Val/Lor Paralyse,Critical,Lifesteal
Zatoichi Bo 4 3D6 6 Sam/Mnk Paralyze,Critical,KO,BlindingFlash(60)
When I asked about the same question here some time ago, I was told Demons even had Muramasa blades and other "Isle of the Dead" items. Maybe you can find this old thread.
Be ready to fight for a long time and be careful not to raise your level too much. If all your skills reach 100, you're stuck. (Happened to my monk).
Simon