Valcore

Valcores (Orcus Valcorus) are a species of orcid sapient beings.

Physical Description
Valcores are extremely tall humanoids with pointed ears, rock-like skin and antler-like protuberances on their bald head.

Behaviour
Valcores are savage beings who live on their own in mountain areas. They are capable of entering years-long slumber, until they are awakened by a great commotion or by the approach of another Valcore of the opposite gender. Valcores can be reasoned with but are nearly unstoppable when in a rage.

Lifespan
Awake Valcores age at a normal, human rate. However, time seems to slow down for them during their hibernations, which can add centuries to their apparent lifespan.

Magical Abilities
Valcores are incapable of magic. However, their antlers, if crushed to a powder, can enter into the composition of some potions. Moreover, they share all Orcids' magic-resistant skin.

17th Century
In 1704, a malevolent female Valcore called Coridra managed to make his way into the domains of Hogwarts with the intent of razing the building and slaughtering the wizarding children, in revenge for a wizard having recently caused her harm. Unable to harm the being directly, the Transfiguration Professor at the time was able to corral her into the Forbidden Forest with magic. There, she was eventually brought down by Centaur archers.

British Ministry of Magic Classification
Valcores are classified as Beings by the Ministry of Magic, and given the threat level of XXXXX, although Dolores Umbridge repeatedly lobbied for them to be reclassified as Beasts. Indeed, they were classified as such in the 19th century until the Valcore Baggall came to the Minister of Magic himself and, in impeccable English, required for their status to be changed. As a result, Valcores are still included in some Beasts repertories.

Canon

 * Valcore on the Harry Potter Wiki