Wow, I did miss quite a bit it seems. Thanks a lot for clearing up some important points.

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I haven't found finite proof of why the Sharran's are after the astral prism. I skipped the rat quest in Act 2. I wouldn't be surprised if someone pops up with Viconia's diary.
This, Viconia tells you when you descend under the house of grief and confront her. She says that she saw the cult of the absolute as a direct threat and competitor of the Shar cult. The absolute appealed to the desperate and lost, which was their own core-business. So she sought for a way to destroy the competing cult and had found out that they were looking for an artefactg which they considered a threat. She didn't know what it was, or how it worked, but decided to try to get it herself and once she had it in her possession, find out how to use it to destroy the absolutists.
So that is the "why". How they (Shadowheart) ultimately found and identified it is still a riddle.

Last edited by ldo58; 27/11/23 04:37 PM.