The Sandy-Grey Bomb was merely half the size of a fist. But it had been packed to the brim with grey sand after the space inside had been increased and stabilised by the Mudropper.
When it slammed into the Dralh Sea, it exploded, pouring out the grey sand that mixed into the Dralh Sea and consumed the latter.
Voraciously consuming all matter to expand without limits was the function of the grey sand. And in the Dralh Sea with large amounts of energy in the form of heat and billowing waves, the grey sand expanded rapidly.
Unlike the Sandy-Grey Void ring where the Mudropper purposefully controlled its potency and limited its danger, the one unleashed now possessed the actual power of the Sandy-Grey Void that bordered Sumatra Continent, in all its glory.