I think the angel was captured and brought to the tomb to kill. Presumably a ritual, or a special weapon/spell, a cursed location and/or the combined effort of several Black Ring mages would be required to kill an angel. They wanted to kill her because she was trying to stop the preparations they were making leading up to the a ritual to summon the Lord of Chaos.
Other than what Zandalor describes, I don't recall any details about the prophecy.
I think Smiruk was there to provide a quest and break up the hack and slash aspect of the catacombs. The Larians may also have wanted to have a few more friendly orcs in the game, since they were basically tricked into helping the Black Ring. Also, watching him test axe candidates was amusing.

I believe Rivellon is a planet. What we see in DD is only a small portion of it. D2:ED will show more of Rivellon, and some familiar places changed with time.
Maybe Verdistis was build on the lizards' swamp? Maybe they just like damp places, and the sewers give them easy access to various resources. Maybe they were planning to attack the city, but the Black Ring's plans never got that far.
Maybe the Larians just needed an opponent in the sewers, and didn't want to go with giant rats or alligators.
The baby at the end was a human child, required as a vessel to summon part of the Lord of Chaos.
The D2:ED
fansite kit includes a novella by Rhianna Pratchett covering the time from the end of DD up to a little while before the start of BD (which is set about 20 years later). I posted a summary of the story
here before the pdf was available. It also contains the prequel story to Divine Divinity (don't recall if it mentions the prophecy directly, but it deals with the previous attack by the Lord of Chaos, and his not-quite-complete defeat).
Posted by Marian in another topic;
*sigh*
I would have never thought that the language of pure image is so hard to understand. We have to think about that in the future...
MAJOR SPOILERS AHEAD!Ascension "Blessing" cutsceneAfter you got sacrificed by the council of seven your spirit awakes in a divine realms on an altar. Around you the ideas of the seven gods are manifesting. You can roughly separate impish, human, elven or orcish gods...
Everyone of them grabs into their chest and puts a small part of the heart into your weightless shape. After you received all blessing the

in you is fully developed and so her wings grow and she flies up to the mortal plane where she descends as the reborn hero into the wastelands.
Extro sceneYou see the demon of lies dying. In fact you see the mutiliated body of janus ripped into pieces and the leftover, the sword of lies, remains. It comes closer and tries to seduce the hero. The hero is tempted to take it but refuses and sends it back to hell away from the mortal plane.
Then the hero hears the cries of the baby. Knowing that it is the lord of chaos inside the child he/she draws the dagger to kill it. In the hero's moral struggle to kill a neborn innocent child the scene fades out.
Much later you see the hero walk out victorious into the swamp area. He carries something. Loot? The child? You don't know for sure...
Somewhere on a distant hill Arhu and Zandalor watch you coming when suddenly the statue you lifted up in the sky while entering the katacombs of aleroth comes down finally...(side joke, nothing more)
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