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See the walkthrough for Kill Kamber, a book you can buy in the game:
"To enter his castle, you'll need two items: the Eye of Fire from King Locrinus in Castle Crest and the Death Stars from the Oracle Spider in her home behind Kamber's Castle. You get the quest to find these two items from the Enclave Wizard, Enclave Wizards, second floor. When you have the two items, throw the Death Stars at Kamber's castle door."
You need the stars from Locrinus. Then with the eye of fire in your backpack, throw the stars at the front door. You only get the stars from Locrinus if you bring him the Blessed Censer and Incense of Life. Go to Druid's Circle and find the Chief Druid. Have you done that? You can buy Incense of Life from Isolde the Herbalist.