"Buffy the Vampire Slayer" and its characters belong to Joss Whedon, "Myranor" belongs to Significant GbR. The Ring of the Ravesaran is one of the magical artefacts that can be found in that PnP RPG.
Xander knew that it had been wrong, but he could not stop himself. This ring was too beautiful for not wearing it. He found this softly glowing ring made from white-golden metal in the Magic Box
while waiting for his girlfriend. And thus his problems began. He noticed that his hair began to change. It began to shine. He also noticed that old scars and skin impurities were fading away. And the rest of his body hair slowly began to fall out. He did not notice it at first. It was Anya who told him. She found the hairs in his bed and asked him about it. But Xander knew nothing.
Some days later he noticed two things that made him afraid. His gentials were shrinking and shriveling and he was develloping breasts. Those were not the only things. He also lost height. One inch in a week.
So Xander asked Giles. And was receiving a severe lecture about not touching any of the magical artefacts if he do not know what they do.
"And what does this ring do?" Xander asked the Watcher and gave him the ring.
Giles took the ring and examined it carefully. He did not put it on because he knew that only ring could have been the reason for Xander's changes. After scanning through several tomes and asking Anya about the origin of the ring, a question she could not answer, Giles found something in an old tome written in a strange greek dialect.
"I know what is happening to you." he told Xander at the next Scooby meeting. "The ring you have foolishly put on is called the Ring of the Ravesaran. According to what I have read in this tome the Ravesaran are chimaeras created by powerfull wizards. They live on the continent of Myranor on the world of Dere. They were designed as pleasure slaves and are true hermaphrodites."
"Hermaphrodites. That are persons who are male and also female. The Ravesaran are androgynous hermaphrodites of extraordinary beauty."
"Are you telling me, that my boy-toy is turning into a Ravesaran?" Anya asked.
"No," Giles replied. "Xander will be transformed into a woman of great beauty."
"I'm sorry, Xander." Giles shook his head. "There is no way to prevent this. And there is also no way to end this."
"My poor Xander." Anya was crying.
"Well, Xandra." Willow said. "Welcome to the other half of mankind. I hope you enjoy the experience."