"Dream big. Dream looming. Dream a force that is ...
A Metamorphmagus (pl. Metamorphmagi) is a witch or wizard with the ability to change his or her physical appearance at will, rather than requiring Polyjuice Potion or a spell like the rest of the wizarding population. They are extremely rare.
Snatchers were members of an organisation of bounty hunters formed by Lord Voldemort when he seized control of the Ministry of Magic in the summer of 1997.
Potterwatch was a pirate radio programme hosted by Lee Jordan for those who rebelled against Lord Voldemort and supported Harry Potter during the Second Wizarding War.
The Taboo curse (incantation unknown) is a powerful spell which designates a word as a key to revealing the speaker's location.
Necromancy is the Dark Art of raising the dead. It is also most likely the branch of magic used to create Inferi, Zombies and Charmed Skeletons.
An Inferius (plural: Inferi) is a dead body, reanimated by a Dark Wizard, similar to a zombie. They are created through the magical branch of Dark Arts called Necromancy.
A rather dangerous curse, when the incantation is uttered its effect is the equivalent of an invisible sword; it is used to slash the victim from a distance, causing rather deep wounds. The slash follows the user's wand movements.
As every first year Potions student learns, a bezoar is a stonelike mass taken from the stomach of a goat that acts as an antidote to most poisons, but does not work on everything.