I was originally planning to make Asmodeus the ultimate bad guy of an upcoming campaign I am DMing, but when I discovered the background in AD&D's Guide to Hell I was immediately sold on the concept of the conflict between Jazirian and Ahriman, so I want to go with that.
The thing is, we're playing 3.5e where the backstory of Asmodeus is a bit different (the whole "I can mete out punishment for mortals: sign this contract and skip the fine print that says I can tempt them into evil), but I feel is not mutually exclusive. The main problem I see with this is that the moment his avatar shows up amongst the angels, Jazirian would recognise Asmodeus as the avatar of Ahriman and have his sorry butt eaten by five dozen angry flying feathered snakes. So I was wondering, could Ahriman create an avatar that could fool both Jazirian and the gods themselves? Or perhaps have Jazirian know the truth of Asmodeus, but not tell the other gods for reasons of her own?
Now of course, you could invoke the "your campaign, your rules" thing, but I would prefer to try and stick to the story without messing too much with it. I think that Asmodeus' background as presented in Guide to Hell and Fiendish Codex II can be put together as follows:
- Creatures of Law are born from the primordial chaos, the mightiest of whom are Jazirian and Ahriman.
- The two form an ouroborus, and create the Outlands, the Unity of Rings and the Rule of Three. They get into an argument over the Center of the Multiverse and tear each other's tails off.
- Jazirian flies to heaven, makes her realm on the fourth layer of Celestia. Ahriman falls to Baator, becoming grievously injured.
- Other gods begin to rise up and take the fight to the demons. As one of the first steps of his scheme, Ahriman creates an avatar called Asmodeus, who poses as an angel.
- Asmodeus invents punishment for sinners, and is asked if he could please not rip folks' skin off by cutting them at the waist then pulling it off like a grotesque sweater right in the gods' front yards. He agrees, and writes the Pact Primeval so he and his fellow angels can move to hell and continue their torture there.
- Baator is completely barren, but Asmodeus uses his powers as Ahriman to make it inhabitable, and gets called out by the gods for this. He pulls out the Pact Primeval and a novelty oversized magnifying glass and shows them the fine print. The gods get sick of him and cast him out, stripping him and his kind of the status of their angels.
- Ahriman pours himself a martini the size of a lake, sips it and mutters "Just as planned".
And then all of history begins to happen. Sure, I've been thinking about adding in Zargon and He Who Was, but I'm not sure how to do that quite yet. But anyway, could this above story be in line with how the backstory is described in the Guide to Hell and the Fiendish Codex II?