The Angel race is one of the many races that the user
guyverek made in his mod "Complex Breeding". (putting this here in case someone is new in this thread and doesn't know the mod)
here is a guide that i made for the complex breeding mod
there is a part where i show the races where i can get
here it is to get an angel, just pass the mouse on a human slave and put the mouse on the name "human" and you will see the what you need to have the evolution you want
View attachment 2680044
basically you need to have a +8 sacred and +4 magical.
you can do that by breeding with monsters but in the brothel you have to make the slave breed with specific customers
arcane convlave to make the slave's children be born with magic essence
knight order to be born with sacred essence
ps: in to unlock knight order you need to alredy have reputation with the other guilds. you do that just puting slaves in the rooms where you upgraded with the specific guild that you want.
or option B that is to have make a slave with sacred essence (like the elf from the elf scientist or the sheep from the blacksmith) breed with any monster then have the human slave have the essence that allows it to have human babies with the monster (demon for goblin and orc. Feral for werewolf) and keep breeding and having slave and monster babies until you have a level 8 sacred and level 4 magic.
but to remove demonic or feral essence when you don't want it anymore you need to upgrade tentacle room to have" + [demonic] essence" because the plus remove from the slave and put the energy on the tentacles rooms in general