Loss of Race and Class multiplier cards.
 

There are cards like Super Munchkin, Half Breed etc. which allow the player to
have multiple classes and races in play. When the death condition does occur,
do these class or race multipliers discard, forcing races and classes to go as a later consequence? Or do these multiplier cards endure past the death condition being met?

Re: Loss of Race and Class multiplier cards.
 

They are treated as being part of your Race or Class, so you keep them through Death.