From the publisher's blurb:
If you saw the last issue, we presented several new undead oriented cavalier orders. And you may be wondering, how can these be employed? Well, in this issue we introduce a new alternate class for the cavalier, the Pale Adversary. This unique class has close ties to the world of the undead with an undead mount and the ability to summon undead allies as it progresses in levels. In addition, we present the Order of Thanatos that may be used with this class in case you didn't pick up Issue #78, Deathly Orders.