The Silver Summoner

About
The Silver Summoner is a summoner boss, and the second boss to be encountered in the game. He attacks mainly using drones and traps, but he also uses a cannon for added damage.

Behavior
Normal Mode: This boss works in phases. You must beat phase one in order to reach the later phases, which he will then switch back and forth between every 800 frames.

Phase 1: The boss spawns in his first phase. In this phase he has a shield of drones swarming around him which must be destroyed before damaging the boss for best results, however you still can hit the boss if you want to. The boss will enter his second phase as soon as he is taken down below 1000 health, and when he does so all remaining drones of his shield that you did not kill will begin to chase you in a big, deadly cloud. Make sure to take care of the drones before triggering his second phase.

Phase 2: As soon as the boss drops below 1000 health his second phase begins. In this phase he transitions between two attack methods.

Method 1: The boss keeps himself within a set distance from the player and rotates around frantically, while shooting and spawning traps, which persist into his second attack method.

Method 2: The boss will quickly move to the center of the arena and raise a shield. This shield stops any type of bullet, but Redd's Mega-laser and Crimson's pool of blood will still damage the boss even while his shield is raised. While his shield is raised he will rapidly spawn drones every 150 frames.

Hard Mode: He behaves pretty much the same as in normal mode with a few minor changes. He shoots faster, moves more frantically in method one of phase two, and he spawns drones more frequently in method two of phase two.

Strategy
The Silver Summoner is a pretty simple boss to defeat, but if you're playing in Hard Mode then defeating him faster will benefit you greatly in later stages of your playthrough. Try to kill the boss before he goes into his shield form, and if you can't quite get him in time, at least be sure to kill him before he goes into his shield form the second time. Also, be sure to kill all of his drones in his first phase before triggering his second phase to avoid being swarmed to death. Moving back and forth very slightly while he's circling you in his first method of his second phase will make hitting him easier while keeping you almost entirely protected from his shots and traps.