Alan
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Have you checked here?
/topic/548/
If that doesn't work at all, you can quickly open a couple of obelisks, use trial and error to find the Tear of Ashera, load an earlier save, and dig it up very early. The problems will disappear immediately, of course, if there are no glitches.
If you dig up the tear before the quest about finding it appears, the script won't trigger, and the mission will become impossible... so don't cheat! 8))
Тьма - это то, что позволяет смертным не забывать, как ярок бывает свет.