TheWoWDBJust as an FYI, to anyone doing this quest and thinking it maybe bugged because using the flasks on the elementals never seems to work:
The living, corrupted water that flows through their bodiesSample, then kill. They gotta be alive when you use the flasks on them.
Quest
Catalysm
A World of Warcraft quest in Eastern Plaguelands. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
It was misleading because the tooltip for the items said to use it on "the body" of a plagued elemental.
Also take note that it can be used on all elementals in the water, not the purple plagued ones.
Quest facts
LevelLevel 15-30
Quest ID27453
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(27453))
Description
Coagulated rot is potent on its own, but we need something to activate its concealed powers... a catalyst. You can find just such a catalyst to the south, in Lake Mereldar. If you look down, you'll notice that I slipped a set of flasks into your bags while you weren't looking. These flasks can be used on the water elementals in the lake. The living, corrupted water that flows through their bodies will be the perfect catalyst!
Community notes from Wowhead · 23 comments
Top 3 shown aboveThe comments below were written by Wowhead users. They are community notes, not TheWoWDB comments. See them in context on Wowhead.
The top 3 are shown in Top Comments above. Read all 23 on Wowhead.
Experience4,100 XP
ReputationArgent Crusade +250
Reward details
Reputation: Argent Crusade +250
Led by Tirion Fordring, the Argent Crusade combines the reformed Order of the Silver Hand with the Argent Dawn in one final push against the forces of the Lich King.
Reputation group: Wrath of the Lich King.
Other quests in Eastern Plaguelands that reward Argent Crusade reputation: Rough Roads (+350), Zaeldarr the Outcast (+250), Frederick's Fish Fancy (+250), To Kill With Purpose (+250), Dark Garb (+250), Just a Drop in the Bucket (+250).
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.