How do you beat the djinn?

Combat Tactics. Fighting a djinn is about working quickly, and not something a witcher should attempt without good cause, or good pay. If you must face a djinn, dimeritium bombs are too useful to go without, giving a witcher the chance to close the distance without being frozen, burned, or electrocuted.

What happened to the Djinn in The witcher?

The Witcher’s Third & Final Wish Geralt cuts it even closer, too, since the genie’s physical form is inches away from killing Yennefer when he finally acts: The djinn opened his mouth and stretched his paws towards her. The witcher suddenly understood what it was he wanted. And he made his wish.