(Probably Found) Fantasy novel - boy with magic arm

[LadyMidnight]

looking for a book i read about 20+ years ago

The book’s story is set in a fantasy world
The main character is a human boy whose father cut his arm off because local priests predicted some boy missing an arm would arrive and have it fixed with a magic one they had to attach on and fulfill some prophecy

the boys companions are his vampire girlfriend and a barbarian girl whose skin is turning to stone.

only read partway in, the part of the plot I can remember is the group are fleeing an evil brother/sister sorcerer couple who are trying to stop the boy from fulfilling the prophecy

The cover of the book had the boy touching some artifact that was burning his hands, his vampire girlfriend covering her face and barbarian girl just watching

 

[CassFrank]

Hey, LadyMidnight,

Check this out. Good clues in this query for the same book:

“A pair of evil twins, a guy and a girl rule over the land. They have the ability to create voids or some type of black nexus tornado which can destroy things. The hero of the story, when he is young, loses his arm and is then fashioned a metal or golden arm instead. He is taught in a monastery with all these smart people. But then the twins destroy the monastery. Other heros include a mother, who was touched by one of the voids. It transforms her body into stone so that she turns into a hulk-like being. Another is the hunter kind of guy and the last is a girl, the hero's love interest who also happens to drink/eat blood. In the first novel, the hero gets a part of the spear. In the second he gets another part and uses the two parts to create a golden light that can heal almost anything, but the problem is that using only two of the three parts severely taxes and ages him. Instead of traveling to find the third piece of the spear, he instead decides to stay back to defend a small island of people from the evil twins. In doing so, he ages considerably. A prophet told him that if he stayed, the chances of getting the third piece would be extremely hard. He does manage to wound the twins, but thanks to this wound, they are able to develop a technique (involving them having sex with each other), that virtually makes them invulnerable. They develop, in essences, a healing/immortality technique. And that's where I stopped reading.”

Finding a book I read a long time ago, Fantasy

Both of them are science fiction/fantasy novels. Both span more than one book. The first one: A pair of evil twins, a guy and a girl rule over the land. They have the ability to create voids or some type of black nexus tornado which can destroy things. The hero of the story, when he is...

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