The late game of V Rising requires a lot of specific materials, such as Sludge-filled Canisters, which also received a minor rework with the full release of the game. Here's everything you need to know about farming and using Sludge-filled Canisters in V Rising.
HOW TO EASILY GET A SLUDGE FILLED CANISTER! (GUIDE) | Secrets of Gloomrot | V Rising
The only way to get Sludge-filled Canisters in V Rising is by crafting them at the Fabricator. You unlock the Fabricator and Canister crafting recipe after defeating Ziva the Engineer, a level 74 V Blood boss in the Gloomrot area.
To build the Fabricator, you will also need 200 Tech Scrap, which can also be found in Gloomroot. Normal enemies hardly drop any Scrap, so I recommend going to villages or farms and looting their wardrobes, closets, and chests.
Build the Fabricator and use the following resources to create the sludge-filled canisters: