Lufwood
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Lufwood is a fictional plant derived from the Edge Chronicles, a series of books created by Paul Stewart and Chris Riddell.
The Lufwood tree is ash-grey and very tall, with a straight trunk devoid of many branches up until the canopy.
Lufwood timber has many unique qualities: it burns with a purple flame, which some find soothing. It is also one of many "buoyant woods" of the Edge, meaning that it becomes lighter than air when aflame and can shoot off like a rocket; therefore it has to be burned in stoves. This attribute has led to certain sky-pirates using the wood in punishments known as "skyfiring": a mutinous person is strapped to a burning piece of Lufwood (or any other buoyant wood) and then released to shoot off into open sky, never to return.
Most buoyant wood is also lighter than usual in normal temperatures, so they are often used in the construction of sky-ships. It is known that Woodtrolls favour Lufwood for use in their stoves and certain rituals.
