Well... in ADOM there is a difference between blessed/cursed and order/chaos.

It's an interesting suggestion. I can imagine a character annoying a lawful god and getting his equipment cursed and then converting to the dark side of the force.

It does sound like a lot of work to implement, eg. What happens when the character is "blessed," "fate smiles," "cursed," "doomed," the spell "bless" and holy/unholy water.

I'll just repost my blog post, which I feel would be appropriate here:

A few ideas:

In ADOM blessed items deal more damage to demons, undead and similar nasty buggers. The problem here is that all blessed items work like that, regardless on how they came to be blessed :( I mean, holy water produced by a C PC on a C altar does exactly the same thing as holy water produced by a L PC on a L altar?

Maybe there could be more than one type of blessed item, based on the alignment? Like:

Law-blessed item: Deals more damage to chaotic creatures (which already automatically includes undead and demons). Provides some extra bonus to L characters, increasing with alignment (L+ > L > LN). Provides extra penalties to C characters (again, increasing with alignment).
Any corruption from a Law-blessed item (either on enemies or on wielder) is lessened.

Balance-blessed item: Deals a bit more damage (not much) to lawfuls and chaotics. Provides extra bonuses to N characters (best to N=), gives some penalties (relatively minor) to L+ and C-.

Chaos-blessed item: Deals more damage to lawfuls, provides bonuses to C characters and penalties to L. Any corruption from a
Chaos-blessed item (either on enemies or on wielder) is increased.

For nonwearable items, the rules of thumb might be:
Law-blessed: a bit dull, but very reliable items - hard to damage, low RNG ranges for effects.
Balance-blessed: Medium-range, like current blessed items.
Chaos-blessed: High-risk, high-power items. Large RNG ranges, bad effects happening together with good (like zapping a chaos-blessed wand gives more damage, but you might suffer some minor corruption as a result), items might be powerful but damage easily etc.

Now each monster and dungeon floor might have defined what are the chances for various item states to be generated.

This way, chaos creatures might have lots of chaos-blessed weapons which are quite unpredictable and might cause trouble in hands of lawful PC.

The question to keep in mind is always: will this make gameplay more enjoyable.

If a blessed item suddenly starts having bad effects I think it would only be confusing.

Can't see why cults who worship chaos god(s) can't have sacred (aka blessed) items in their possessions. Same goes to holy water. It's water -> It will be blessed by dark god -> You get water that is holy for that specific god. At least I can't see any lore specific problems here. If you want weapons to be more related to weapons you should focus on prefixes and suffixes. I'm not a JAVA coder expert but I think those are easier to add and make interactive with aligments than changing whole b/u/c system which is more than enough at the moment (at least for me).

I prefer the current simple system. It makes sense to me that an item can be blessed or cursed by a dark god in the same way as a benevolent deity. There is a bit more of an issue when it comes to blessed weapons having a stronger effect on undead and demons, but a simpler system would be for this to simply not work for chaotics (just to make things harder for the bad guy).

Like they say: A blessed item for a chaotic? It's a blessing from a chaos god. This existing system is already very good, although in ADOM1 I wished that there was a nicer way to also create unholy water (without doing anything drastic to begin with, of course). Cursed item = item that is cursed to work against its user, you.

In fact, I believe it was implemented at some point in ADOM history, I'd have to pull up the GB version history, but I think it is there.

No need to revive this guys, it has been already rejected.

Its status is still "suggested". :)

Yeah, the community has clearly rejected it, but that doesn't mean TB will, or that he won't take certain ideas from it or its discussion.