First Idea: Railguns!
Does 100 damage(I know thats overkill, but it punches through anything it kills/destroys). Can be backpack or turret mounted. Uses 5-10 million EUs per shot. Destroys all blocks but bedrock.
Rails:
Barrel:
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= Rail
= Lapotron Crystal
Backpack:
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= Barrel
= Lap-pack
Turret:
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Any other ideas?