Well, the guidebooks says you can't sac spawned creatures, but I think you should make it clear that you can sac the creature which was randomly generated, but not the ones it spawned.
Yay, I got the firsst post on page 50! By the way, it seems that enemies can sac you to their gods and then throw rocks at you... "The goblin rockthrower screams prayers to his god! The goblin rockthrower throws a rock at you! You are engulfed in roaring flames! You die..."