Anvil and Lazarus were doing trolls (vile, with red aura) at glaciers, Anvil was blood red, Laz was light blue. After a while, Anvil got back to grey aura, but Laz was still light blue. I came across this before at peacefull lumbering ogres (vile, with blue aura). I was grouped with Olga who had a reddish aura, and after a few dozen ogres, he was still reddish.
Laz said that vile mobs should make you grey no matter what aura they are. I thought the same thing too but it appears that it doesn't work if you have a red aura, doing blue aurad vile mobs, or if you have a blue aura, do red aurad vile mobs.


Is this a small error or was vile designed this way?

Gradius considers the following races vile: orcs, ogres, goblins, trolls, and
kobolds. When a cleric or paladin of Gradius kills a creature belonging to one
of these races, the resulting alignment shift will only be beneficial. Gradius
requires his followers to remain close to neutral, which previously meant
killing too many orcs would push Gradius into good and throw off his alignment.
However, because the alignment change will only help a cleric or paladin of
Gradius, this is no longer the case.

thats the help file, stating that the alignment shift will only be beneficial, therefore i think thats a bug =P

This is how vile was designed - if you are evil (Olga) killing a good mob (peaceful ogres), you would normally become more evil. Vile prevents you from becoming more evil (since it's away from neutral), but it does not turn you good.

The help text for vile suggests that the alignment change will always be beneficial. It's true, but a little misleading - if the alignment change would normally hurt you (take you away from neutral), it instead becomes 0 and has no effect. Thus, all alignment shifts that DO happen will beneficial. But you can only go from evil->neutral by killing evil mobs, not by killing more good mobs.

I've updated the help file to make this clearer.