how old of games do you like?
These are all the RPGs i currently have installed on my Mac.
None of them are Native versions, they are all Windows or DOS versions running though packaged up .app ports using Wineskin, Cider, or DOSBox, no Windows/Bootcamp required.
some are very old... 20+ years, but i still love them.
In mostly alphabetical order....
Baldur's Gate (Cider)
Baldur's Gate II (Cider)
Betrayal at Krondor (DOSBox)
Crusaders of the Dark Savant (DOSBox)
Dungeon Hack (DOSBox)
Elder Scrolls II Daggerfall (DOSBox)
Elder Scrolls III Morrowind (Cider)
Elder Scrolls IV Oblivion (Cider)
Eye of the Beholder Trilogy I, II, III (DOSBox)
Icewind Dale (Cider)
Lands of Lore (DOSBox)
Might and Magic DOS collection, 1 through 5 (DOSBox)
Might and Magic 6 (Wineskin)
Might and Magic 7 (Wineskin)
Might and Magic 8 (Wineskin)
Might and Magic 9 (Wineskin)
Neverwinter Nights 1 + expansions (Wineskin)
Neverwinter Nights 2 + expansions (Wineskin)
Ultima Underworld Duo 1 + 2 (DOSBox)
most of those (14 of the 19) are ports I made myself... so I can help you getting copies if you want.
All the ones I made are available in the DOS or wrappers section over at portingteam.com forums.