<P> In Goblet of Fire, it is said that a House - elf who has been freed is normally told to find a new family to serve . There is an Office of House - Elf Relocation at the Ministry of Magic . House - elves are unendingly loyal to their human families; so much so, that Dobby, who served the Malfoy family, attempts to punish himself each time he utters a negative remark about them (even after his freedom) until the final book, in which he defies Bellatrix Lestrange . According to Kreacher, "a House - elf's highest law is his master's bidding"; however, while House - elves must obey their masters without question, they have been known to find loopholes in orders that allow for unintended interpretations to protect themselves or their friends . Because of their docile, obedient natures, some families abuse their house - elves; Dark wizard families in particular seem to make a habit thereof, as when the Malfoys forced Dobby to torture himself, or when the Black family customarily decapitated their house - elves as they became enfeebled by age . Nonetheless, most house - elves are horrified by freedom even from the most cruel masters . Dobby, the first introduced, is the sole exception; but this extends chiefly to voluntary service, paid labour, and choice of his own employment and costume . During her time at Hogwarts, Hermione Granger establishes S.P.E.W. (the' Society for the Promotion of Elfish Welfare') to champion House - elves' rights; but gained little interest from her classmates or the House - elves themselves . After Hermione begins leaving elf - sized clothes around the Gryffindor common room, intending for Hogwarts' House - elves to inadvertently free themselves while cleaning, Dobby confides in Harry that the other House - elves find the idea so insulting that Dobby is the only resident elf willing to clean in Gryffindor Tower . </P> <P> In Deathly Hallows, Dumbledore tells Harry: "Of House - elves (...) Voldemort knows and understands nothing . Nothing . That they have a power beyond his own, a power beyond the reach of any magic, is a truth he had never grasped". Kreacher also leads the House - elves of Hogwarts into battle against Voldemort's forces . </P> <P> Obscurials are magical children who attempt to repress their magical abilities . If kept unchecked, this oppression manifests and corrupts the user's magic, creating a dark parasite known as an obscurus . The host obscurial keeps the form of the child, appearing normal, if emotionally distressed due to their forced hiding of their magical nature . When their power is unleashed, the child and obscurus share a form of a large shadowy ethereal cloud, usually causing destruction due to the child themselves having little to no control over the obscurus . The host and parasite may retake the form of the child later, again with almost no input from the obscurial . Due to its consuming nature, obscurials rarely live past childhood, and obscurials who do make it to adolescence are considered outstandingly powerful magic users, though they still will have no control . </P> <P> Obscurials first came into notice when wizard - kind was persecuted by non-magical users . In an attempt to hide their true nature and blend in with society, their pain would cause their magic to manifest into an obscurus . As such, obscurials are feared even among witches and wizards, who see them as not only destructive, but a threat to the International Statute of Secrecy . Even today, the creation of obscurials persists through the persecution of magical peoples all across the world . </P>

What are all the magical creatures in harry potter