Large Apparatuses are found within the Hall of Transference.
The Large Apparatus is used for the following:
- Granting access into a Promyvion zone for the first time (left apparatus)
- Sealing your memories of a Promyvion zone (left apparatus)
- Teleportation to Tu'Lia (right apparatus)
It is interesting that they glow different colors, possibly tied to the area they are associated with. For example, the Mea one glows green. Tahrongi Canyon is most often Windy Weather.
The Holla one glows blue. La Theine Plateau is most often Rainy (water) weather.