I have to admit, I didn't know much about vampire spawn, so I just kinda took it at face value. :P For Succubus/Incubus, I was going off the Forgotten Realms wiki, since I remembered them being demons originally. But, LOL! As i read further, there seemed to be much confusion over what they were. :P
https://forgottenrealms.fandom.com/wiki/Succubus
