What does this information mean?
Grassblade was aghast to hear how the life energies of his Green Hood comrades who fell when Deathfist Citadel was retaken by the Deathfist forces, have somehow been stopped from rejoining the life flow. Being an accomplished burglar, he has volunteered to not only show me how to gain access to Scourge Keep, but to also help me solve this mystery.
Enter Scourge Keep by clicking the sewer entrance beneath the Bridge of Zek.
The entrance is underwater at ( -193, -36, -579 ) /waypoint -192.61, -36.12, -579.35
The needler fish do not see invis.
Speak with Grassblade once inside the Keep ( -7, -17, -125 ) /waypoint -7.05, -17.03, -124.93.
He is 180° around the moat from where you came in (of course!)
Search for a missing Green Hood.
Speak to a Green Hood spirit ( 45, -10, -103 ) /waypoint 45.38, -9.62, -102.98
Speak to another lingering Green Hood spirit in The Supplier's Hoard ( 23, 0, 19 ) /waypoint 23.40, 0.07, 19.46.
This spirit becomes aggro and attacks.
Speak to another Green Hood spirit in The Depleted Armory ( -11, 1, 20 ) /waypoint -11, 1, 20.
Speak to another Green Hood spirit in the jail ( Qulkor's Rest) ( -15, -10, 7 ) /waypoint -15, -10, 7.
Rendezvous with Grassblade in the sewers under Scourge Keep.
Jump down the well into the sewers. Grassblade is right there at ( 34, -11, -28 ) /waypoint 34, -11, -28.
Talk to him to complete the quest.