This fix is essentially a copy of the post;
FIX for broken Imp Council Member questAs before, credits go to;
Kordoba - '
OK I GOT IT!! This is how to get your Explosive Keg back or any other lost item!'
and
Harglowe - '
Rimmer is missing'. Both are quoted as references in the link above.
Background;
There is a quest to find the holy sword, dagger and amulet. The three must then be sacrificed to give one high quality
Nobleman's sword, dagger or amulet (your choice).
There is a book in the basement of the cursed Abby which describes the quest, and warns not to wake the guardians in the place of sacrifice (the stairs to which are just north east of the church, partially obscured by some trees). Unfortunately, it is very easy to find the place of sacrifice
before the book in the cursed Abby. Touching any of the four tombs within will awaken a liche, and break the holy item quest.

For exact details on how to get and sacrifice the three holy items, see Dragon's post;
VERY BIG SPOILER ON HOLY ITEMS.
Please read this post through before attempting, and make sure you follow the steps below carefully.Solution;
1)
Save your game under a new name (better safe than sorry), such as 'holy item fix'.
2) Make a backup of the story.000 and story.001 files in the newly saved game folder, perhaps by moving them into a subfolder.
Important: you
must restore these files at the end of the procedure.
2b) Confirm that you have completed step 2.
3) Find a saved game from before you entered the place of sacrifice and touched one of the tombs. If you do not have such a saved game, start a new game, save it right away and use the files from there. I tested this with a different character class, gender and name; it worked fine.
4) Copy the story.000 and story.001 files from that saved game folder to the 'holy item fix' folder, overwriting the files there if necessary.
5) Re-load the 'holy item fix' save.
6) Stand in the right hand circle in the place of sacrifice. The statue should then ask you which item you wish to sacrifice for (or tell you that you do not have all three items). Make your choice, then save to a new game, such as 'nobleman's item'.
Save before identifying the item if you want to be able to re-load to get good stats. I quick loaded for awhile to get my holy sword, and got a few crappy ones; the worst was
damage 21-50, +4 agility. That's
it (don't remember the charm quality, if any).
6) Delete the story.000 and story.001 files from the 'nobleman's item' folder, and replace them with the
backup copy of those files from the 'holy item fix' folder.
6b) Confirm that you have completed step 6.
7) Re-load the 'nobleman's item' save.
You now have your Nobleman's sword, dagger or amulet.

The quest will remain on your log as uncompleted, and the statue will tell you that you do not have all three holy items, but you get the experience for completing the quest, as well as the Nobleman's item.