User blog:Disfigure/Regarding Evil Lord Wrath's role in Volume 12

Yes, that was confirmed by Maruyama to have been Evil Lord Wrath rather than Demiurge (Jaldaboath) who later join in the battle against Remedios, Calca, and so on. During the middle of the fight, Demiurge did switch places with Evil Lord Wrath to fight in his stead. It happen when Remedios's attack on Demiurge threw him away to the house is where it all begun. As the house collapses, I assumed this gave Demiurge time to pull off do something like that with the Holy Kingdom's soldiers.

Source:

It was on Maruyama's blog: https://mypage.syosetu.com/mypageblog/view/userid/170524/blogkey/1844589/



Maruyama said that in Volume 12, Jaldabaoth was cosplayed by A-san and B-san and if you know who was B-san then you must've spend lots of money on overlord( referring to those who brought the BD box set that included a concept art book and Wrath's character design was in it. (Information obtained from a reddit user, Vulpix0r on r/Overlord).