From the introduction:
Six years ago, a group of Pathfinder archeologists at a remote dig site in the Terwa Uplands made an incredible discovery: clear evidence of Azlanti occupation, refuting the common belief that the Azlanti had no settlements in the Mwangi Expanse. The archeologists came under frequent attacks by the charauka, the vile ape-men of the Mwangi. The Pathfinder expedition’s leader, Juliet Dias, directed construction of a wooden palisade, but the charau-ka called forth an enormous Abyss-touched champion to smash through it. Fortuitously, visiting Pathfinders activated one of the site’s ancient defenses—an enormous iron golem. This golem defeated the vile champion and scattered the attacking charau-ka. The attack also scared off the historical researchers, who hastily covered up the site and vowed never to return.
From the introduction:
For Tier 3 - 7.