Where do I find information for making a vampire hybrid character? I own both HoS and the PHB3 but I can't seem to find any information on creating a vampire hybrid. Am I simply overlooking something obvious or is the vampire class just so terrible it can't even be used to create a hybrid character?
According to the compendium, the information for creating a Hybrid vampire is in Dragon Magazine 402. You can check here and type in vampire hybrid : http://www.wizards.com/dndinsider/compendium/database.aspx
You may also want to see this question: Is the Hybrid Vampire any good?
I personally did not go for a Hybrid when I wanted to make a Vampire character myself, but that was mostly because I didn't want to screw around with making a Hybrid in general, and I found that, for my personal needs, the multi-class Vampire feat had everything I wanted for the Vampire PC I did make.
it seems(from DCShannon's comment) like it might be in 400 instead? I have no idea why it would show up as in 402 and be in 400,... but you could check both at the very worst I guess?