Location 1: Every creature drawn into the Pyramid of Shadows arrives in the Entrance Pit. The adventurers arrive here when they complete Encounter A1 (see Adventure Book One, page 6). The pit is full of the bodies of those who died during-and specifically, because of-Karavakos's failed attempt to conquer and settle his kingdom. As part of his ongoing punishment and imprisonment, this pit contains the fallen soldiers from both sides of the conflict, the innocent casualties of war, the victims of the oppressive reign of Karavakos, and the series of friends and advisers that Karavakos grew to increasingly distrust until he had them banished, imprisoned, or put to death for displeasing him.
Now they are all here, within the pit, rotating into and out of existence to maintain the exact depth of bodies that are present when the adventurers arrive. Occasionally, one or more of these bodies animates as a zombie to continue the fight in which it died or to work its way toward the Sanctuary of Light to remind Karavakos of the many sins of his past.
One creature that was trapped during the pyramid's occasional appearance in the natural world is Gurrak, an ettin who has claimed the entrance pit as his own personal hunting ground. He collects heads from the corpses that fill the pit, but they disappear and eventually return to the pit thanks to the magic of the place. So, Gurrak much prefers to hunt new arrivals for the heads he so proudly likes to display.
When the adventurers appear in the pit, show the players "View of the Entrance Pit" on page 23 of Adventure Book One, and read:
A stench of death and blood assails you as you appear suddenly atop a pile of bodies. Humans, dwarves, elves, halflings, and others, all apparently recently killed but all wearing clothing and armor of an earlier age. The pile of bodies seems to shift, as though something might be moving beneath it. Above you, at the top of the pit, you see a hideous, two-headed giant-he's rubbing two blades together with an eager gleam in the eyes of both its horrifying heads.