Yarana D'Ven in Longshadow Alley needs help with her research, but doesn't have time to collect components.
Kill 8 Filthy Moccasins in The Serpent Sewer (-168, -80) and return to her.
She then sends you out to kill 7 Slime Sacs in Fallen Gate (in the tunnels above the waterfall).
Next up she sends you to kill 2 Suspended Watchers in Fallen Gate.
Last is to kill 2 Thexians in Fallen Gate.