RChu1982: This leaves the dilemma for the Priest, the only one in my party to be able to use Mace and Flail weapons. Diamond Eyes, The Mauler, or Vampire Chain?
Diamond Eyes was quickly eliminated, as it's short range, is best as an off-hand weapon, and does mediocre damage.
This leaves The Mauler vs The Vampire Chain. The Mauler does more raw damage, but suffers from initiative maluses, reducing the maximum number of swings per attack.
The Vampire Chain, I worked very hard to create. I farmed Vampire Bats in the Lower Monastery for this privilege. It's time now that the Priest can hit from extended range, draining what (hit points or stamina) from enemies? He enjoys +3 To Hit and +3 To Initiative from this.
The Mauler is also short range.
Diamond Eyes's damage is not "mediocre". In fact, I consider it to be a high-end weapon, even when The Mauler is available and you can't dual-wield. It can paralyze (which, unlike KO, undead are not immune to), and it provides an initiative bonus. (You should check to see if it gives you an extra possible swing.)
The Mauler is quite strong, and it boosts Mace & Flail skill, which could give you an extra attack. You also get a small Kill chance. It also allows for the use of Crush, which can be nice on a Priest whose only long-range damage spell is Falling Stars (and I usually reach Ferro before I get access to that spell). Just be aware that you need 50 Strength to equip it; if you do not have at least 70 Strength, being hexed will force you to unequip it, which could be bad.
The Vampire Chain is decent, particularly with range and the small heal when you hit an enemy with it, but:
* It doesn't inflict KO, Paralyze, or Kill. (Does do Drain Stamina, but that's not going to disable an enemy unless it gets hit repeatedly.)
* It only gets half your Strength bonus (or penalty, for that matter). Hence, Diamond Eyes in the main hand will do more damage than the Vampire Chain, if you have decent Strength.
* You can't dual wield it. (Though you can use it as a shield.)
In practice, I find that whips work best on Bishops who are not trained with a focus on melee combat, as such characters generally have more use for a shield and are not usually in the front. For Battle Priests, I'd probably go with either Diamond Eyes if it will give the extra swing or I want Paralyze more than KO, or The Mauler otherwise. (Then again, the battle Bishop in my current party is actually using the Staff of Doom.)