Ascendancy of the Last

Lolth has come out of hibernation with a plan that may be too ambitious even for her. To pull it off, she'll need the help of former drow priestess Halisstra Melarn, who has betrayed her at least once already—and who Lolth transformed into the abominable Lady Penitent. Will this risky gambit be the end of Lolth and her demonic servant?