Moon Blade

[Kalgain]

The Moon Blade is supposed to :

Attacks with the moon blade are melee touch attacks. Its strike saps vitality or life force, causing no visible wounds but dealing 1d8 points of damage plus 1 point per two caster levels (to a maximum of +15) to any type of creature except undead. Undead are visibly wounded by a moon blade. Their substance boils away from its touch, and they take 2d8 points of damage plus 1 point per caster level (to a maximum of +30) per blow.

My cleric/hierophant is lvl 20, has a caster lvl of 22

he does 11-18 dmg vs normal monsters, thus 1d8+10
he does 24-38 dmg vs undead, thus 2d8+22

it seems like the damage vs normal monsters is capped at +10, even though it should be at +15

[Valefort]

It was changed to 10 to limit its usefulness against non-undeads.

[dedude]

The change is reflected on the wiki, but I may have forgotten to update the in-game description.

[Kalgain]

Valefort just added it to the wiki

[dedude]

Valefort just added it to the wiki

Hah! As usual he beat me to it.