Boss Battle Research

For my boss inspiration, I looked to the game Metal Slug 5. Most of the bosses have the same tropes, but the boss I looked at the most was the tank shown in the video at 3:56.  This boss is fairly stationary, but has different types of bullets- bullets that are slow and fly straight forward, bullets that fly around chaotically, and bullets that actually follow the player.  This is paired with the ability to call in other enemies to distraught and damage the player.  

For my boss, I want to have a military theme, (the military attacking the monsters that have been attacking the city) So I think a large tank that summons other smaller, weaker tanks/ground units while the actual tank itself is fairly stationary might be interesting. These units could also spawn more ammo and health as needed. Hopefully, I want to have the tank lose parts off of it as it receives damage.