Mission to Lexicon

In 4 ABY, a group of individuals associated with the New Republic undertook a mission to the aquatic Lexicon, in the Unknown Regions, in order to find the lost  Ezra Bridger, as well as  Thrawn, who had been lost alongside Bridger. These individuals were the droids C-3PO, Huyang, and R2-D2, the Sabine Wren,  Luke Skywalker and Ahsoka Tano.

The mission succeeded with the group successfully finding Bridger and Thrawn, but the objective of the mission was altered with Thrawn's revelation of an Observatory being present on Lexicon, associated with the  Palpatine's Contingency protocol. The group traveled to the Observatory, where they discovered a supposed threat which Palpatine was monitoring.

The group also discovered that there were five other observatories in, and decided to then travel to the one located on Bastion.