A Limestone altar is a piece of furniture that can be built in the Chapel of a player-owned house with level 64 Construction. It gives 175% Prayer experience when bones are offered at it. With one incense burner lit it gives 225% Prayer experience, while with two lit incense burners it will give 275% experience.

Players may prefer building this altar instead of the higher-level Marble altar and Gilded altar, as the limestone altar is the highest-level altar that does not require Marble blocks to construct.

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