"Vainglorious Bastards" is the second memory (mission) in Sequence 8 in Assassin's Creed IV Black Flag. Both Optional Objectives have some setup work involved. If you are after them, read each BEFORE starting the mission with Charles Vane.
Optional Objectives[edit]
Damage the Royal African Pearl with an upgraded ram
Use the Fort's defenses to sink a ship
Objectives[edit]
Locate the Royal African Co. ship