Where do you get the sonic boom thing. Thanks in advance.
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Head to Dark Agon Wastes via the portal in Command Center, then go through the annihilator door in Phazon Grounds.
The Sonic Boom (Annihilator Combo) is found in Ing Cache 2 of Dark Agon Wastes. You need to use the Screw Attack to reach this room from the Phazon Site and you obviously need the Annihilator Beam (to open the door). You're welcome in advance!
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