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You cast Locate Object and soon you can sense the rock. It’s back on the ledge in the magma chamber. You head back, grab the rock, and inspect it in your hand. It’s invisible, and when looking through it, your hand disappears.
This special item can be crushed to make your entire party invisible and inaudible for a short duration.
Now that you have the rock, swing back to the temple and head on out to
41.