Might of the Inquisition
Cleric of Lolth
Alice Starr once was an ally of the party, working to help thwart the Pelorite Prophecies. Secretly, she was a Cleric of Lolth, working to spread discord and depair. As part of that, she corrupted the Jade Chalice before delivering back to Istarmani.
Thanks to some early successes and the Inquisition's ignorance, they granted her favor and promoted her to head of the Church of Pelor in Alexandren. From there, she gained power and prominence, and spread the corruption.
After Istarmani's transformation into Drow, she joined up with him for their mutual goals (possibly in the service of Lolth) and married him, forming a power couple in Alexandren politics.