Bombay Cat - Otherwise, known at a black cat!

A sensitive wand, hazel often reflects its owner’s emotional state, and works best for a master who understands and can manage their own feelings. Others should be very careful handling a hazel wand if its owner has recently lost their temper, or suffered a serious disappointment, because the wand will absorb such energy and discharge it unpredictably. The positive aspect of a hazel wand more than makes up for such minor discomforts, however, for it is capable of outstanding magic in the hands of the skillful, and is so devoted to its owner that it often ‘wilts’ (which is to say, it expels all its magic and refuses to perform, often necessitating the extraction of the core and its insertion into another casing, if the wand is still required) at the end of its master’s life (if the core is unicorn hair, however, there is no hope; the wand will almost certainly have ‘died’). Hazel wands also have the unique ability to detect water underground, and will emit silvery, tear-shaped puffs of smoke if passing over concealed springs and wells.

Unicorn hair generally produces the most consistent magic, and is least subject to fluctuations and blockages. Wands with unicorn cores are generally the most difficult to turn to the Dark Arts. They are the most faithful of all wands, and usually remain strongly attached to their first owner, irrespective of whether he or she was an accomplished witch or wizard.
Minor disadvantages of unicorn hair are that they do not make the most powerful wands (although the wand wood may compensate) and that they are prone to melancholy if seriously mishandled, meaning that the hair may ‘die’ and need replacing.