You need to get the phylactery from Terikan's tomb. I presume this is what you're referring to when you say you have the item you need. Take it into Jamoth's tomb. Jamoth's tomb is easy to find because there's a statue of Jamoth in front of it. Just click on the statue to see the identification, as usual.
As soon as you step into Jamoth's tomb carrying the phylactery, you should get a message that Terikan will bother you no more. And you should lose the phylactery from your inventory. If this is not happening, you are the victim of some new bug. (Be sure you have the right tomb.)
Once this is done, go back a couple rooms to the friendly cleric ghost. That room will have changed and the ghost will be standing in a different place. Talk to him and he will point out a new container in this room, which has a key you need to continue. It unlocks the door at the far end of the Hall of Heroes.
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