*Pretty much does the trick in any scenario. For large bosses, you'll have to mix up the ground and air combo for unbroken pieces

Note: This is a very repetitive combo and can take enjoyment out of the game if you only use it. Most of us are here to make cool Gunpla anyways...

*** Be sure to upgrade the mace as you level up! ***

Step 1: Acquire Extra Large Mace
Step 2: Lock-on target
Step 3: Perform combo
Step 4: Enjoy parts and S ranks
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Example Gif [i.imgur.com]

L = Left Hand
R = Right Hand
(visual cue to look for is that your gunpla has done the first four swings, or two for air, and then spam the final button)

Combo (Ground):
L > L > L > L > R (spam)

Combo (Air):
L > L > R (spam)