A Limestone altar
is a piece of furniture
that can be built in the Chapel
of a player-owned house
with the Construction
skill. It gives an 175% Prayer experience
or Demonic ashes
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.