Ok, this is very expected event. I think, that Re-stize can susprisly win,for too high price, but win. And no, no everything planned by Demiurge, the true great sad victory. But there's probality that Re-stize will be totally defeated, almost all dead.
But there's another scenarios. Maybe there will be defeat of Re-stize, but Sorcerer-king will be mercyfull and generous. Or maybe there will be no battle. Just before battle will maybe make deal of peace, either like optional vasality of Re-stize, or just... Peace. Or "sudden" dead of some important guys, or their "sudden" change of views(and personality a little bit). Maybe will Ainz promises the Barbro's body(cremated) to Ramposa, or Barbro's ressurcetion(or give the dopplerganger lookong like him). But maybe it will be a real Barbro, who's like someone with potentional phobia of anonym redhair Nazzarick detizen will be excelent future ruler who will had something more than respect of the Nazzarick... Or maybe he will wanted the revenge. Or just will be here some new problem for Nazzarick what is more important, and for this will be Ainz have no choice.
The another scenarios.
Will be here maybe some who defeat of Re-stize reserve. Maybe it will be Slane. Maybe it will be Platinum Dragon Lord, or some another Dragon Lord. Or some another like Magic Kingdom(but them and Slane will be maybe will attack, just cuz it will be change to destroy to with one shot.
Or there there will be Nazzarick allies who betray Ainz, and battle will be fifty-fifty.
Or there will be new fraction. The fraction who isn't in the map(in my oponion in ideally situation the dignifed oponent for Nazzarick, or maybe stronger than them. They're maybe will be the old friends of Ramposa or Evileye, PLD, or someone, but maybe it will be the brand new threat, who want conquere both Re-stize and Nazzarick, or in short, they want conquere all. And since this time will Nazzarick must shallow pride, and Ainz will must in his own interest make a alliances with... Anyone. But certainly with Re-stize. And maybe then start new epic fight of survival and rul, between armies, politics, ambitious ones, machinators and culture, the full of agony, glory, blood, war, old hatreds, merits, falls, new friendships, love, betrayals, intrigues, changes, mismatches and reconcilation...
OK, probality of this is max 4%, but it's just maybe... Guys, c'mon, it would be epic...