I did this mission yesterday. It was kind of horrible to get to the final stage. First we did the north branch of the cave then the east....that decision was a mistake. Had to do the half of the east branch a third time. The "normal" enemies were tough and it was a great challenge getting rid of them. The champions were cool too (with an annoying healing ability ) But the final boss was so weak we had him about 20 seconds. This was a disappointment.

I'm not really looking forward to spell my mail-address...it has 35 characters. I still would like to have a removal and/or re-register a new device via the website. I asked on twitter if they were planning to implement this on the website. The answer was I have to call the customer support for removal....even though this was not my question. So the future of this feature is still uncertain.