What are Account Skills?
Ceres M Guide
Account skills are permanent, passive skills that you can learn. Once learned, their effects are automatically applied to all your heroes. You can see your account skills by tapping your leader’s portrait in the upper-left corner of the screen.
They are divided into two types: Basic and Special. Basic Account Skills become available as you increase your Account Level. Trophies are needed to “purchase” these skills. More trophies will be required for higher level skills. Special Account Skills require Rubies to be learned. Higher level skills require more rubies.