Until a couple of weeks ago I'd never done an "epic trial", which I guess is what passes for a raid in Neverwinter. When I finally overcame my reluctance and queued for (normal) Demogorgon (the epic trial introduced with Maze Engine), I was pleasantly surprised by how easy it was and that it didn't even take ten minutes.
So when I recently hit the maximum amount of "potential bonus rewards" for the epic trial Assault on Svardborg, which you accumulate from questing in Sea of Moving Ice, I thought I'd give that one a try too.
I got a pop after about fifteen minutes. Everybody seemed kind of hesitant to run in and start the fight, until one guy finally took the lead. I followed him and immediately got turned into a block of ice. I stayed that way for about ten seconds, then died. This repeated a couple of times (me running in, turning into an ice block and then dying a few seconds later), with other people also dying left and right; then everybody abandoned the instance.
I looked up the basic strategy for the fight to better understand what had happened and to be honest it sounds way too complicated for a pug even on normal. For example when people get turned into blocks of ice, others are supposed to break them out within seconds or the frozen person dies (like I did). As if that's going to happen with a bunch of randoms!
I guess those bonus rewards will remain unclaimed.