Found a problem (I think) with the Charactermancer and Aasimar race based on Mordenkainen Presents Monsters of the Multiverse (MMoM). According to that book, subraces are gone basically. If playing an Aasimar, you choose a "Celestial Revelation" that sort of matches the old subraces, but you don't get to choose the revelation until 3rd level. When creating an Aasimar character based on MMoM, the charactermancer asks you to choose a subrace at 1st level. This is wrong according to MMoM.