Regardless of what difficulty you picked up the quest on, and what difficulty you turn it in to, you will always get the Normal colored version of the set. So if you picked up your last fragments in LFR, you can turn it in after Odyn or Helya, you will still get the Normal set.
The full Raid Finder, Heroic, and Mythic colored sets drop off any of the bosses on their respective difficulties - you will pick up the 'set' as a single item, and then will learn it upon use. No quest required.
Quest
Trial of Valor: The Lost Army
A World of Warcraft quest in Trial of Valor. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
As of now, [item=142487] also drops from mobs outside of the Trail of Valor raid while doing the Helarjar Landing: Vrekt world quest (Stormheim, 72.0 86.0). This includes mobs like [npc=116601], [npc=116600] etc.
However, it seems to drop only while you haven't completed the quest and the drop is low... I suppose you can avoid killing [npc=115846] to keep farming as long as you wish.
For those of you doing legacy content, here's a few things you might want to know:
Fragments drops of Guarm and Helya on all available difficulties.
Guarm drops significatly less fragments than Hel, but together it's around 150.
You can do all 3 difficulties in a single reset and get around 450 fragments.
Normal and Heroic was easily soloable but Mythic wasn't (ilvl470 hunter).
Heroic and Mythic have a 100% chance of dropping the heroic version of the transmog set, regardless of if you finished the quest or not.
Quest facts
The client quest POI data records no map location for this quest, so no map is shown.
Check whether you have already completed this quest
in-game: /run print(C_QuestLog.IsQuestFlaggedCompleted(45088))
Description
While Helya's defeat is your primary objective, I require more of your aid. Helya has gained the ability to steal and corrupt the souls of my Valarjar. Her minions hold these souls, corrupting them. I am certain Helya herself hordes the greatest Valarjar souls to herself. You must recover these lost souls, then return them to me. Do this and I will reward you with blessed guard from the hall's armory.
Getting there
Inside the raid: Trial of Valor
Since Loken's betrayal, Odyn has been trapped within the Halls of Valor as Helya plots in the shadows to claim the souls of his valarjar champions. In recent days, however, great heroes have arrived in the lands of Stormheim in the Legion's wake.
Bosses in the Adventure Guide, in order: Odyn, Guarm, Helya.
Entrance: Stormheim at 71.1, 72.9.
Instance text, bosses and entrances are the client’s Adventure Guide data.
Community notes from Wowhead · 161 comments
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