The supply container containing Thaumetic Sulphite at the Docks
The Undying Blockage in the Warehouse Sewers
Act III Quests
Find a way to destroy the Undying blockage in the Warehouse Sewers.
This quest begins when you first approach Undying blockage in the Warehouse Sewers.
Then you need to go to Solaris Temple Level 3 and speak with Lady Dialla. She will give you The Ribbon Spool quest, which must be completed first.
After that go to The Docks and find Thaumetic Sulphite.
Bring it to Lady Dialla in Solaris Temple Level 3.
Go to Warehouse Sewers and burn Undying blockage.