A wand is a quasi-sentient magical instrument used by the majority of Wizardkind to channel their magical powers in order to concentrate it and create more complex results. Most spells cast by witches and wizards are done with wands, but there are alternatives to concentrate one's magic. Wandless magic for most wizards is very difficult and requires much concentration and incredible skill, however that is not the case for all beings; house-elves, for instance, have their own brand of magic that they perform without wands, as do Goblins, though they evolved to use wandless magic after their defeat in the Goblin Uprisings. Each wand consists of a specific type of wood that surrounds a core of a magical substance. Wands always choose their masters, but it is unknown why or even how this occur