I obtained this quest after capturing a Twilight Whelpling, right outside the Grim Batol dungeon.
Quest
Young Twilight Scale
A World of Warcraft quest in Wetlands. Facts and objectives from the current retail game data.
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Eryna appears phased out during the Midnight pre-patch event. I could not find her to complete the quest.
Edit: See @Knotraptor's fix below. Great find, nice job!
Edit: Managed to get the NPC Eryna to spawn, flew into the Wetlands. Then came in from behind Grim Batrol over the top of the mountain. That seemed to do the trick. I have already done the quests that @galette said to do, but she still hasn't appeared. Will try some other tricks see if anything works.
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(56371))
Description
<A partially-grown scale from a young twilight whelp. More and more twilight dragons are appearing once again. This seems suspicious. You should show the scale to Eryna above Grim Batol in the Wetlands, perhaps she has seen something recently.>
Community notes from Wowhead · 14 comments
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Reward details
Reputation: Champions of Azeroth +350
Enlisted by Magni Bronzebeard, the Champions of Azeroth seek to heal the wounds caused by Sargeras' burning blade and save a dying world.
Reputation group: Battle for Azeroth.
Item facts are the current retail client’s (ItemSparse); the specialisations for a pick-one item are the ones the Blizzard quest API lists; faction and currency text is the client’s own. Lowest listed price = the US commodity auction house now.
Guides for this zone
Guides and routes on this site that cover Wetlands.