It is listed as a Monster feat, but its only prerequisite is a Special Attack. My question is, could a PC take this feat on something like say, an Antipaladin's Touch of Corruption ability to improve my DC on my Cruelties?
Monster Feats are available to players. They're just in the bestiary because they're primarily used by monsters. And craft construct is in there because it's useless to have the feat without the monster rules.