ring of the holy

[Mystic Phoenix]

I haven't assembled it myself yet, but it consists of the three parts you might know:
- Necklace of Exorcist
- Sandals of the Martyr
- Holy Cross
(names may be slightly different, though)

You get -50% attack and defend to all undead (including your own, I suppose, but that's just a guess) and +2 Morale to priests, inquisitors and paladins. I wonder if you loose the benefits of these artifacts when you assemble them.