RESOLVED 4-1: The Lost Ruins
I'm going to attempt it again at some point, but while playing my RAcaseal (SKYLY Lv 34), I openned the entrance to the ruins after finding the pillar in the mines (area prior to ruins?), and proceeded through the boss room that is now destroyed, and found the entrance open, and a warp back to Pioneer 2.
I thought that I couldn't go in, so I used the Pioneer 2 warp. After that I had to go back down inside, proceeded through Ruins 1 and 2, fought the waves of monsters at the end of Ruins 2, then used the Pioneer 2 warp.
After that though, I can't turn it in, and everything is explored except for one door that requires four players. (And a purple switch somewhere... not sure if those are related.)
I'm going to go back to attempting to explore further... but I'm having my doubts on completing it this run through. :c
Seems I've somehow resolved this by having one session of doing both 1-2 and 2-2 quests involving the previous two pillars (though completing those did involve having to touch the pillars in the first place), and then upon touching the third and finishing the quest, it registered as complete. So onward I go. ^.^