Ghost General is one of the Kabukimono targets you’ll face in Assassin's Creed Shadows. Assassinating him requires careful planning because he follows a patrol route in a heavily guarded area ...

You have to assassinate Ember as part of the The Kabukimono set of Objectives in Assassin's Creed Shadows. You're only given a vague description of where Ember is found in Assassin's Creed Shadows ...