Has anything been written regarding the combination of an amulet of Protection from Undead and a holy symbol in the tool slot? I could be wrong, but I'm almost certain that the holy symbol improves the effectiveness of the amulet, especially if both items are blessed.
I first noticed it playing a mid level hurthling bard character (i think) crossing the underground graveyard. I had both aforementioned items blessed and equipped (not deliberately, I just did) and made it through most of the graveyard without any stat drains or even any confusion. For reasons I can't recall I replaced the cross with another tool and immediately started getting whacked with confusion left right and center. I replaced the cross and all was good again.
It could be a coincidence, but ever since I seem to have used the combination with quite some success.
Has anyone else noticed this connection?