What is a cambion? What about a yugaloth?

[Squire James]

I'm fairly sure Iuz's mother is a human mage named Igvilv. I'm not sure about the father, but I think it was the demon prince Graz'zt. This would explain why Iuz is such a show-off... he's just a half-demonic chip off the old block!

I vaguely remember some stuff from Gary Gygax's books about Igwilv bossing Iuz around a bit, being one of the few mortals that could get away with it. Current Greyhawk material doesn't include her as someone within Iuz's inner circle, so it's safe to say they've had a falling-out in recent years (it wouldn't be the first time).

 

[John Q. Mayhem]

In the 3E MM under half-fiend, it says that humanoid half-fiends are often called cambions. I believe the EN World converted-creatures-thing has a more like earlier editions cambion.