Shar Shar ( pronounced " SHAHR " ) , the Mistress of the Night , was the goddess of darkness and the caverns of Faerûn , as well as a neutral evil greater deity . Counterpart to her twin Selûne , she presided over caverns , darkness , dungeons , forgetfulness , loss , night , secrets , and the Underdark . Among her array of twisted powers was the ability to see everything that lay or happened in the dark . Shar ' s symbol was a black disk with a deep purple border . Shar was also the creator of the Shadow Weave , which was a counterpart and attack upon the Weave , controlled by Mystryl and her successors , before both of the Weaves fell into ruin during the Spellplague . History . Shar and her sister Selûne coalesced out of the material of Realmspace after it was created by Ao . They were incredibly close at first , so much so that they believed themselves to be the same being . They worked together to create the heavens and the planets and then created Chauntea to embody the planets and infuse them with life . Selûne lit the worlds while Shar coated them in shadows . Chauntea , however , claimed that Selûne ' s light was not enough for life to thrive like she wanted it to and begged the sisters for warmth . Shar and Selûne argued for the first time — Selûne wanting their realm to be filled with more life while Shar was happy with the state of things as they were . The two quarreled violently , creating Targus , Moander , and Jergal in the aftermath . At an impasse , Selûne reached into the Plane of Fire and set the largest of the planets alight . Shar attacked again and tried to smother the flames but Selûne had torn off a part of her own body and hurled it against her sister . The raw magical power of Selûne ' s body punched a hole through Shar ' s and out of the two chunks of their bodies , Mystryl formed . Mystryl aligned herself with Selûne and , outmatched , Shar fled , vowing revenge against them both . Shar brooded for aeons , striking against her sister whenever she saw the opportunity but unlike Selûne , Shar did not have allies . At least , not until she was courted by the shadevari — thirteen chaotic lords of shadow who had witnessed the births of Shar and Selûne and much preferred Shar ' s ideal of a realm of darkness . They helped her grow stronger but then Azuth sealed her allies away in another crystal sphere , foiling her plans . For roughly the next seven centuries , Shar returned to brooding until Ao forced her avatar to Toril during the Time of Troubles . Shar ' s power increased when she killed Ibrandul , though she lost the opportunity to also kill Sharess , whom she had been slowly corrupting . Nevertheless , in the wake of the Godswar , Shar was revitalized in a way she hadn ' t been before and began actively subverting Selûne and the new goddess of magic Mystra . Shar eventually made allies of Bane and a patsy of Cyric in 1374 DR . Together , their followers attempted to conquer Myth Drannor while the Church of Shar attempted to wrest control of magic away from Mystra through various means . Shar ' s plots were defeated but she did absorb most of the divinity of her son Mask , but not before he managed to secret a portion of this power to his Chosen , Erevis Cale , using the Black Chalice . This portion was , however , absorbed not only by Erevis but also by Rivalen Tanthul and Drasek Riven . . Eleven years later , Mystra was dead at Cyric ' s hand and Shar combined the Plane of Shadow with the Negative Energy Plane to create the Shadowfell , where she ruled over darkness ever since . Divine realm . Shar ' s realm was originally on the Plane of Shadow and was a tower that had no obvious entrances called the Tower of Loss . She would trap those who enjoyed their freedom inside , savoring their despair at their loss , though she would allow petitioner s and visiting worshipers to freely come and go ( perhaps to further torture the trapped ones ) . When she created the Shadowfell , Shar abandoned the Tower of Loss and created a new realm in the Astral Sea , larger than any of the others there . Among the dark scenery , with its black sand and shadowy natural features , lay the Towers of Night . Her new abode , a more palatial one than her old home , was built atop the tallest mountain of this realm . Access to the Shadowfell was easy from here and she shared the realm with Talona , Sseth , and Zehir . Relationships . The creation of the Shadow Weave made Shar the eternal enemy of the goddess of magic , Mystra . This resulted in the brewing of a terrible war between these two powerful deities . By her very nature , however , Shar was opposed to powers of light , the unsecretive Shaundakul , and her own sister , Selûne . Her only frequent ally was Talona . Those who believed in the Dark Moon heresy believed that Shar and Selûne were two faces of the same goddess . Worshipers . The clergy of Shar were a secretive organization that pursued subversive tactics rather than direct confrontation with its rivals . In addition to her clerics , Shar maintained an elite order of sorcerer monks who could tap Shar ' s Shadow Weave . Among her worshipers were the Shadovar of Thultanthar , who fled into the Plane of Shadow before Karsus ' s Folly . Shar also held power over all who used the Shadow Weave .