I would like to start this topic in order to inform and discuss about changes and the current status of the mirror world.
Here a short Q&A:
Q: Why can't i enter the Mirror Altar/Mirror Ruins/Mirror Tower?
A: Those mirrors belong to the second group of the mirror worlds and are not supposed to be opened yet. You have the opportunity to run the first 3 dungeons and collect the Cenedrils of group 1 for now. The second group will be released at a later time.
Q: What are those item with SysXXXXXX_name and what shall i do with them?
A: Those are some future rewards which can also be bought in the mirror shop later for mirror shards. We expect them to be named after our next patch which comes probably around easter. You can collect them and put them to your bank to use them after their final release.
Q: Why do i have a 7m 30s countdown in the mirrors, though the message says 15 minutes?
A: Because we have lowered the countdown. As you may have noticed the dungeons are still pretty easy even if you run them solo. 7m 30s are enough.
Q: Are the mirror worlds in a test phase and will there be worked on in the future?
A: Yes, we are running them in a test phase at the moment and we will constantly work on this feature. Another reason why the other 3 worlds are closed for now.