Just finished spire of the watcher solo, never left it from the begging till the end and still hasn't received triumph. It was my second solo completion, first time I didn't know that you are not allowed to leave the dungeon.
Did I get it right - there is no way I can white directly to support?
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So I looked at your dungeon report an you did complete is in one run start to finish, the only think I can think of that it was a 4h run, an if you left at any point an missed a contacting desrony servers banner that would invalidate the run.