|The Magitek Rearguard uses the following moves and mechanics:
Cermet Pile: Standard conal tankbuster. Just keep the tank topped off and don't point the boss at anyone else.
Garlean Fire: Quite similar to the earlier Gunship's AoE, but fires a line of circles. Just dodge to the side of the circle instead of in front of it. There's a big arrow indicator on it to help show where it will go. As the fight goes on he'll begin using two lines side by side.
Rearguard Bit: These will be lined up on the edge of the arena firing an unnamed attack for major damage. It's a narrow line across the arena, but occasionally ones next to each other will fire together for a wider beam.
Rearguard Mine: Small orange bots will float across the arena, contact will cause them to explode for major damage.
The main thing to worry about is dodging these attacks in combinations. It will frequently use fire, bits, and mines all at once. Try to worry about getting behind it when it turns first, then stand in a safe line where a bit isn't firing next, then adjust up and down that line for the mines last.