Finally got our Flawless Raider Achievement... the best part about it is we did it post Templar patch. This was our 5th or 6th attempt and it's definitely a challenge. The farther you get, the more nervous you get because you don't want to be the one to mess it up (I was the fail on our very first attempt).
Had a great team to run it with and got it done in under an hour. Video of our run (audio is crap but the video is decent).
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After enough runs we started to call the low ceiling (the narrow ledge you need to jump around after the first 3 disappearing platforms) the Ledge Boss. We went one at a time with fireteam leader hovering over the person doing it ready to boot as soon as they called out a fall lol. Got it last night, well 5 of us did... I'm still waiting on the achievement to show up :(