The Troll Pit is on an Expansion square west of the starting area.
Size: 2 x 2
Use: At the end of the Troll King Questline, you bring Excalibam to the square to defeat the Troll King. During the Troll Tribe Questline, you will visit it many times for quest dialogue or to spawn Glimmer Trolls.
After the Troll King Questline, the Troll Pit is movable, but cannot be stored.