I read about the cemetery dungeon in this forum, but I don't know how to get into it. I've thrown holy water at the hanging skeleton and it went away, and I've clicked on all of the headstone runes (6 of them), but now I'm not sure what should happen. Can anyone tell me what else I need to do to access the dungeon?

One of the corner posts of the wall (right diagonal if you are in the crypt facing outwards) can be activated with a simple plain dagger. Use the dagger on the post and it sticks there. Then walk out and around behind the cemetary to find the amazing mushroom patch

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The cemetery in the south end of the Arnika-Trynton Road has an Easter Egg that leads to a small, hidden "retro" dungeon. To access this dungeon click on the six headstones with blue runes (shown as "x" on the map). Then go to the southwest pillar (shown as "P") and insert a dagger (plain dagger only) into it. Finally, exit the cemetery, walk around the outside to the southeast corner, and walk over the new patch of white mushrooms (shown as "M"). You will be teleported to the hidden dungeon. The automap does not function perfectly here, the monsters are tough, and there are spike traps in corners and dead ends. Here is a map and legend of the Cemetery Dungeon.

Thanks for the great replies. I can't wait to see the dungeon!

Angua - Be careful! There are many locked doors in this dungeon. Many have 6 tumblers. You need to get past at least one of these to get to the teleporter out. You can find a lockpick or knock-knock scroll if you search around. My party was at level 10 and I did not think it was too tough down there. I did not has a dedicated lockpicker so I was kinda stuck there until I came across a knock-knock scroll. Good Luck!

I got into the dungeon and it's interesting. The monsters aren't too much trouble, but the automapping is really awful (Just as Helias126 said). I didn't discover the dungeon until now with my level 15/16 party, so I've got high level knock knock and return to portal (I don't like getting stuck anywhere!). Once again, thanks again for all the help!

the auto map is not supposed to work.
they layered the retros on top of each other, not only for level design purposes, but to make it unintelligible.

after all, retros were all mapped by hand. :D

V***V

My answer was for the great guide at :
http://www.volberding.com/Wizardry8/Wiz8Main.htm
its the most complete guide to wiz8...

Thanks