Problem: Completed the Last Refuge Outskirts and used the portal at the end to enter The Council Chambers without issue. However, while exploring the area I ended up leaving The Council Chambers back into the Last Refuge Outskirts filled to the brim with void creatures. Surviving the fight I noticed the portal was missing and the sigil appeared damaged. I looked everywhere for a traveling route to no avail. Eventually, I went to about the middle of the Last Refuge where there is a small guard presence and a transporter pad, though no other locations were accessible using the pad, only the Last Refuge Outskirts were available.
Solution: I had to log out of the game to Character Select, then re-enter the game and, thankfully, I entered the game on the transporter pad in The Council Chambers and could continue the adventure.