Lunar lumber is used in Livid farm. You take it from a log pile, you can select between taking 1 or 5. When you have taken it you need to cast Plank make on it, to turn it into Lunar fenceposts, used to repair the fence. Casting Plank Make on Lunar lumber in the Livid Farm does not require 86 Magic. However, if the player wishes to receive experience from casting it, they need 86 Magic. The Turn Lunar Lumber Into Runes wish will convert a full inventory of lumber into random runes, at the cost of 5500 Produce Points.
A player converting the lumber.
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