Ebony

Ebony
This jet-black wand wood has an impressive appearance and reputation, being highly suited to all manner of combative magic, and to Transfiguration. Ebony is happiest in the hand of those with the courage to be themselves. Frequently non-conformist, highly individual or comfortable with the status of outsider, ebony wand owners have been found both among the ranks of the Order of the Phoenix and among the Death Eaters. In my experience the ebony wand’s perfect match is one who will hold fast to his or her beliefs, no matter what the external pressure, and will not be swayed lightly from their purpose.

A graphic based on Owana's wand wood, ebony. The paragraph is from Pottermore