Aquilaria is an evergreen tree growing up to 40 meters high and 60 centimeters in diameter. Aquilaria is native to Northern India, Laos, Cambodia, Malaysia, Indonesia, and Vietnam. These trees frequently become infected with a fungus and begin to produce an aromatic resin commonly called Aloeswood, Agarwood, and Oud. This resin is used by Traditional Chinese, Unanai, Ayuravedic, and Tibetan physicians. The resin is created in response to an attack from Phialophora parasitica, which is a parasite fungus or mold.

The fungus and decomposition process continue to generate a very rich and dark resin to form within its heartwood. This is the preferred resin used in making fine Japanese incense. The resin created as an immune response makes the most sacred oil on the planet . As you can see the wood is extremely rare and often very difficult to obtain, as well as being quite expensive. The best quality is Kyara. Kyara comes in four types: Green, Iron, Purple, and Black.