Board Thread:Questions and Answers/@comment-119.94.13.74-20200506132806/@comment-39403387-20200506221414

I would usually recommend waiting till after the Erosian War (Not Crisis) to open the ruins, for both Pr0n and levelling reasons.

Though if you feel up for a decent challenge, and are in a very strong position in terms of money, you could concider doing it beforehand, to unlock some bonuses in the war. Though I'm not sure it's 5 mil worth.

It's a bad idea to do earlier or later than these 2 free-roam periods.

The "Quests" section of the wiki provides a pretty good guide to the area.

I went for a more fragile but aggresive team than Lostone2, with Riala, Robin and Qum, to remove most threats before they get a chance to attack, but that won't work unless you have a high level and equipment, with some items that allow you to outspeed the demons there.