Slate

"You got the Slate! Ancient words are written on it."

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In Oracle of Ages, the four Slates are found in the Ancient Tomb, the eighth and final dungeon of the game. In the dungeon, there is a room with a giant stone tablet sitting on a pedestal, with receptacles for the slates surrounding it. When all four are placed into their receptacles, the larger stone tablet will part, exposing the staircase that leads to the dungeon's boss, Ramrock.