I got this drop of a stone hive worker in Rivervale outside the Tower of the Drafling - it is a body drop and drops on grey mobs - but is scarce.
Starter is called Deadly Stinger and is no-trade.
I had to kill 5 stone hive guardians (for stingers) and 3 bixies (for hairs) - the guardians outside the tower didn't update, but the ones inside the Tower of the Drafling did. Every kill updates for guardians and bixies.
Then I had to get a location update from the Windowsill Guard Post - I was already there as it's the where the third bixie in is normally found - so I had to run out of the room and come back in to get the update.
Then 2 more bixies for hairs - again every kill updates.
Then I needed 4 kills for venom. The venomguards around the tracks beyond the overseer's room update this - there are normally 4, in two pairs either side of the tap room (and 2 just beyond it if some have been cleared).
Quest reward is automatic - no requirement to examine the starter item (unfortunately).
Reward is 'Deadly Stinger' One handed dagger - Min level 39 : +7 Str +9 Agi +30 Health +20 Power - 35.2 rating. Mage, Scout, Berserker or Guardian.
The quest starter is removed from your inventory on completion - with no message about loosing it!