The first crypt contains a possessed child.
You can reach that crypt if you speak with Brother Morgan. Promise him that you will take care of the child. After that he will let you enter another room. There, you can see an undead cat called Buttons. You can convince the cat so it can allow you to speak with the child or you can kill it.
Then, you must destroy the Pillars that guard the child. Speak with him and try to take him out of the hole. You will have to use Persuasion. The only dialog line that works is the one connected to Strength.
Warning: If you won't be able to take the child out by using one of your characters then the child won't speak with that character again. If you won't be able to do that four times, you will fail the quest.
However, saving the child allows you to teleport it on Lady Vengeance. This completes the quest.
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