I'm re-posting my comment from another thread, so if this info is already mentioned here - sorry!
I tried this quest yesterday and other than being a bit confused about where to look for the chest in Emprise du Lion, once I found it I easily got the Ardent Blossom from the chest. Mine was a lvl 19 & armor rating of 40, if there's any need to know!
Two things that I've not seen mentioned by anyone else discussing this quest that may help out, there is a second loot chest near the "snow wall" access to the long staircase leading down to the Ardent Blossom chest. Look behind the rubble! And do not drop the Veilfire torch, bring that back down the long tunnel that takes you behind Suledin Keep to score a Frost Rune along the pathway back.
Happy hunting!