Just really basic activated explosives. I made this bomb after being reminded of "gravitons", a word you would also see popping up in Aoki Hagane no Arpeggio. The explosion of this bomb also closely resembles the explosions of the corrosion explosives in the anime; a large red explosion which when it goes away, reveals a large hole swallowed by the explosion itself. Well, it's not TOO much of a resemblance, but close enough.
Requires Newtonian Gravity.
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