Vulcan Raven is the second FOXHOUND member boss fought in the original Metal Gear Solid.
The battle takes place in a warehouse after Solid Snake encounters Raven driving a tank. Raven is a massive shaman and heavy-weapons specialist who uses a Vulcan cannon, and the fight requires Snake to combine explosives, grenades, and careful movement around the tank.
This encounter follows the first major boss battle against Revolver Ocelot and comes before later FOXHOUND confrontations such as Psycho Mantis and Sniper Wolf. The sequence therefore refers to the order of boss encounters, not Raven's position in a military command hierarchy.
Vulcan Raven also appears in the game's ending sequence after his defeat. His character design and dialogue connect the game's supernatural imagery with its recurring themes of inheritance, war, and the burdens carried by soldiers.