Ulkas couldn't help but yawn happily. So much useful information! He was akin to a weary traveler gorging himself on delicious fresh water found in the oasis, forgoing caution and reason. So many possibilities are open here...
"Astrosa, seems like we are in luck! These ruins were once a research or military facility used by an advanced civilization. Human expedition that worked here unearthed only a small portion of this treasure trove, before they - by some mishap or devious trap placed by creators - activated ancient guardians. Now, these ruins are 'alive' and slowly repairing themselves. Which can open for us many previously-sealed doors, but we must pass their guardians first. And they are using advanced fire-based weapons to shoot superheated beams and can use some other forms of long-lost magic. Interesting enemy. And a dangerous one."
Demon chuckled, and, waving off the haze of sleepiness, continued:
"Considering how long these ruins stood motionless, their guardians must have answered only due to some serious transgression by humans. If my analysis is right, there are two most probable reactions. Either they now try to kill every being in sight, or they ask for their identities first. I once encountered similar guardian, though far less advanced, and was able to pass off as "authorized person". I'll try to use this experience here but have no guarantee it is even possible.
Continue exploration, using maps from my head and journal to search for some of the artifacts. If guardians interfere and don't communicate - try the same method that worked on Guardian of Valern Castle. With more power, obviously.