Serum will appear at a Black Site after the Black Site is defended from Phoenix Industries. Serum is required to enhance Units. To enhance a Unit, you must have the required Serum, and the Unit must be stationed at the Black Site. Units that have been enhanced with Serum have better combat statistics and consume fewer Rations that other Units. To enhance Units, go to the “Enhance” tab of the Black Site interface.
Serum can also be distributed between Black Sites that are controlled by the same Alliance. However, you should note that a transaction fee will be charged, meaning that some Serum will be lost. Serum can only be distributed by Alliance Members with Serum and Node access.
You can see how much Serum has been used at a Black Site by tapping on the “History” tab, and then viewing the “Serum Transfers” and “Enhancements” sub tabs.
Your personal access to Serum is defined by your Alliance Role and the privileges set by your Alliance Marshal. If you are an Alliance Marshal, you can give other Alliance Members access to Serum.