Grind is mainly used to remove giant pillars like these that can occasionally be found. It can also be used on a similar ice structure in
Mars Lighthouse.
Grind (グラインド, Grind) is a Venus-class Utility Psynergy that costs 2 Psynergy Points to use. It is only available to Adepts that equip the Grindstone (a gift from King Hydros of Lemuria), which, in a first for the series, can only be equipped by Venus Adepts. Since the Grindstone currently only appears in Golden Sun: The Lost Age, only Isaac and Felix can use Grind.
Grind is used to "Pulverize large objects," namely certain large, brown, stones. This Psynergy is required to depart from Lemuria and reach the overworld back through the Sea of Time, as well as to get from the eastern sea to the western sea through the Gondowan Cliffs. Other uses of this skill include grinding down a mound-shaped mass of ice in Mars Lighthouse so that the ice wall in the room below can be cracked and destroyed with Burst, and gaining full access to the earlier floor of Treasure Isle.
Grind
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 Venus
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2 PP
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"Pulverize large objects." ((TLA))
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Either lowers or removes gigantic mound-shaped pillars or a mound-shaped mass of ice.
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Venus
