Outside Fortress
Power fuses and grab a lure
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Climb the ladder and walk around the fuse. Grapple over to the tuning fork right past the visible crack in the wall. Power the fuse. While praying, get free ice bomb.
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Walk counter-clockwise and down the ramp to acquire a lure. Quickly walk up and grapple back up.
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Run left to the second fuse and power it. While it is falling into place, quickly unequip Glass Cannon and equip the ice bomb and lure. Descend into the dark cave.