Pyramid

General
While the T'thuun pyramids appeared over many different cities, it was only in Unfinished Business that a means to enter the pyramids was uncovered. There are now three permanent portals in Patriarch's Valley that each lead into a different pyramid, though they all share the same landblock.

Though the entrance portal is restricted, the surface portal just inside has no restrictions,

Floor traps will cause spawns to occur as you walk over them. At the top each pyramid is a boss that drops one of three versions of the Summoning Rituals tome.

Creatures in the pyramids drop Invoking Stones that can be collected and given to the Royal Scout at 58.5N 10.3W (any scout??) who will reward with titles. See T'Thuun's Marauders for complete details.

Creatures

 * Minik Ra's Raid Commander

Images
Click image for full size version.