I have the antimagic+ recipe, no idea tho where I got it. But I can tell you if you need it for the first floor you ain't clearing the place without removing collar multiple times. I learned it hard way, I reloaded to get bless II and crafted myself antidark, sold excess materials and crafted/blessed bunch of other consumables. All in vein because ...
Richards domain is BULLSHIT BLAZING. No surprise there is no guide for it. I would like to see the dev stream clearing that domain on pure run without savescumming and abusing flash bombs to skip packs, normal difficulty would suffice. Because that is how people do it I believe, skip everything incl purification points, use flash bombs to bypass packs, save and reload till it works and use collar to kill floor boss. Now if you expected the domain to be similar to the past ones maybe some extra boss or two and don't have 21+ corr to spare, well you are shit out of luck.
Also shoutout to rigid trait having only one counter locked behind academy.