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@optimuspig
The “Mission Portals” mega-thread is probably a good place to start:
Main takeaways:
There are seven types of special materials, three for each faction and one (“Super Rareium”) which both factions need for any upgrade beyond L10.t
The amount of special materials you need to upgrade is shown below the coins cost for each TF.
Do missions to collect special materials. Keep doing missions over and over so you don’t run out and end up having to spend gems.