Talk to Ferdechiond at the Outpost (I-9, Conflux #00); he will give you his Espionage Pearlsack and ask you to check his linkpearls at three different spots, which he marks on your map. Reward depends on your speed.
Go to the three points and click on the ???. They are located at (H-10, G-8, E-11).
Ferdechiond: Why, it seems barely a moment ago that you set off on your mission. Thorough and swift. That's what I like to see!
==> 1500 cruor 1st completion. 800 after that. (Fastest. ~7 minutes or below.)
Your time begins when you accept the quest and ends after you click on the third ???, NOT when you talk to the NPC for the final time.
The safest, fastest route is to take Conflux #04, head NE and get the ??? at G-8. Head south to the ??? at E-11, then continue south and circle around to the ??? at H-10. There are true sight Aestutaurs to manoeuvre through, but it's easier than taking Conflux #7 and trying to manuever through the field of Clammy Imps. Sneak/invis a must. Movement speed helpful if you have it. If you avoid aggro, then you should never fail to get max Cruor reward.
Alternate route: Take Conflux#00=>Conflux#04 and head NE to G-8 for the first ???. Back S to Conflux#04=>Conflux#05. Head NW to second ??? at H-10 (sneak for bats, careful if NM Lord Varney is up). Walk south, past Conflux#05 then W through Devegetators to third ??? at E-11, back to Conflux#05=>Conflux#00. You will avoid Clammy Imps and Aestutaurs with this route. Done in less than 5 minutes with 12% movement speed and using flee once.