[X] Try to get more information out of Robert's killer -[X] Sacrifice it to a god (risk that any information will be lost since it is recent and not intrinsic to the spirt) --[X] The Old Gods
[X] Try to get more information out of Robert's killer -[X] Bargain, perhaps with Rina's aid
--[X] Hear her out what she might want. Something like soul-death with no chance of the Void getting her soul in exchange for information would be an option (if it comes to that, Yss helps permakill)
--[X] If she has less nihilistic desires she could join your Empire in Rina's service, contingent on her swearing off any allegiance to the Others/Void and letting any remaining risks be checked over and removed by Genie-mages and if necessary divine aid.
--[X] This does include secure imprisonment with her word that she does not attempt to flee or harm anyone until the seperation has worked.
[X] Try to get more information out of Robert's killer -[X] Sacrifice it to a god (risk that any information will be lost since it is recent and not intrinsic to the spirit) -[X] R'hllor the Red, be his light reveal the truth
[X] Try to get more information out of Robert's killer
-[x] Bargain, perhaps with Rina and waymsar's aid
-[x] offer removal of void via magic anti other sword (I forgot it's name)