Got this dialogue that had me make two will checks, where the first one was d20 + 13 skill value and the second d20 + 11 skill value. What is this number derived from?
If it was the Shamira Will-Checks against her trying to pry the information about Nahyndrian Crystals from your memory, that is intentional.
Throughout the conversation, she starts casting mind-affecting spells on you as you pass the checks, including a nasty -10 Will Saves mindfog for the last one. You can typically fail one of them and have the Hand of the Inheritor help you out, or if your saves/spellresist is high enough, you can resist all of them by yourself.