Check out DartMUD.
Medieval fantasy, it has the races (although they're unique to that game as far as I know) and it has magic.
If you're more worried about the realism bit though, this could be the game for you. The MUD has no levels or classes, and if you want to learn how to cast a spell you have to find the spell and practice it - not an easy task. Similarly, skills grow through use, not through spending skill points or anything abstract like that. Roleplaying is enforced and death is permanent.
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