Alchemy Association

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The Alchemy Association is a very important building. As is explained here, players should try and rush to level 8 so they can quickly build it. 
*At level 10 upgrade, the building gives 5,000 Cleaner or 50,000 Essence of your choosing every 20 minutes.
*You can get around 3.6mil Essence or 360k cleaners a day at this rate.
*Considering you can only get so many types of Cleaners from Shrines, the building is very important to Stabilise regions efficiently, although it can barely keep with near-minimum stabilization of one area.
*If you change the target cleaner/essence, all materials added will be lost.
*You can also use it to produce blue essence for crafting or produce grey/green essence for companion upgrades.