Reverse Build-Effect

Is it possible to make a reverse build effect? Like a moster dies, and is it possible to make is disinigrate using a reverse build effect?

You should be able to do this with a time IPO, having time run backwards. (Although looking at the build modifier, I’m surprised that you can’t just push a button to have it reverse itself). Barring that you could always render out the frames and reverse them during compositing.