I personally thought Ghimlyt Dark dungeon was quite harder, its last boss constellation to be precise; ignoring that a trial <-> dungeon comparion is iffy, though. Never want to do that one more than necessary and with 50/60/70 roulettes giving only meh xp rewards, I won't have to fortunately XD. I don't have - in comparison - a fair evalutation for Shinryu as the whole party had quite a good chunck more HP than my WAR, thus basically carrying me through the trial. I actually died during the 2nd phase after landing on the ground because I didn't locate the tiny safe spot in time for the huge-ass AOE. Didn't have this impression during Fluminis.