The Arcane Splinters drop from Crystalline Protectors in The Singing Grove within The Nexus.
It seems that everyone in the group with the quest is able to loot them from the same mob.
Quest
Quickening
A World of Warcraft quest in The Nexus. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
This quest name may be a reference to the Highlander movies & TV series. "The Quickening" is the process which makes the characters in Highlander immortal. Once immortal, they can only be killed by beheading. If beheaded, the victor absorbs all of the vanquished immortal's energy, memories, & power.
This seems to coincide with the quest text above.
"There can be only one!" =P
Quest moved inside the actual instance.
At a glance
Quickening is a dungeon quest for level 10-30 in The Nexus. It rewards 5 reward items, 1 reputation reward, 4,100 experience and money.
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(11911))
Description
I've learned more in my short time here than in decades of studies. The ancients here are being exposed to incredible levels of arcane energy. It's literally transforming them into something... I'm confident that there's a final stage in their metamorphosis. Find me some evidence of their final state.
Getting there
Inside the dungeon: The Nexus
In order to reestablish his dominance over magic, the blue Dragon Aspect, Malygos, has launched a ruthless campaign to sever the link between mortals and the arcane energies coursing through Azeroth. To this end, his blue dragonflight is redirecting the ley lines of the world to the Nexus, Malygos' towering lair.
Bosses in the Adventure Guide, in order: Commander Stoutbeard, Commander Kolurg, Grand Magus Telestra, Anomalus, Ormorok the Tree-Shaper, Keristrasza.
Entrance: The Nexus, Borean Tundra at 27.5, 25.9.
Instance text, bosses and entrances are the client’s Adventure Guide data.
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Choose one of these rewards:
Reward details
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Reputation: Kirin Tor +250
The mages and archmages running the city of Dalaran. Faced with the rising threats of the Blue Dragonflight and the Scourge, they've transported their city to the heart of Northrend.
Reputation group: Wrath of the Lich King.
Other quests in The Nexus that reward Kirin Tor reputation: Postponing the Inevitable (+350), Have They No Shame? (+350).
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.