Disillusionment Charms cause a person to assume the appearance of their surroundings, rather like a chameleon; it is used for concealment, often as a replacement for Invisibility Cloaks. When the Charm is cast, the person who is Disillusioned feels as if "cold trickles [are] running down [their] body"; when lifted, the person feels hot trickles, instead. Once the spell is cast, even the Disillusioned person cannot see his or her body (OP3, OP4).
Mentions of the Disillusionment Charm in the series:
- Alastor Moody Disillusions Harry Potter when the Advance Guard of the Order of the Phoenix comes to take the boy from number four, Privet Drive to number twelve, Grimmauld Place; as the group would be flying, the Disillusionment Charm would be more effective than using Harry's Invisibility Cloak (OP3). After reaching Grimmauld Place, Moody lifts the Charm from Harry (OP4).
- When Molly Weasley tries to comb Harry's hair to make it look more presentable for his hearing at the Ministry of Magic, the cold water trickling down his back gives him the feeling of being Disillusioned (OP7).
- The pamphlet sent by the Ministry of Magic to all wizarding families at the beginning of the Second War recommends practicing the Disillusionment Charm, to use in case of an emergency (HBP3).
- The members of the Order who come to retrieve Harry from number four, Privet Drive before the Battle of the Seven Potters use the Disillusionment Charm to conceal themselves on their way to the house (DH4).
- The Disillusionment Charm is one of the spells that Hermione Granger uses to protect the tent that she shares with Ron and Harry while searching for Horcruxes (DH15). She presumably casts it every time they camp in forests (DH14, DH15, DH18, DH19, DH22).
- Hermione suggests that she and Harry hide themselves with a Disillusionment Charm when they go to Godric's Hollow; however, they choose to use Polyjuice Potion to resemble two Muggles instead (DH16).
- Some Invisibility Cloaks, according to Xenophilius Lovegood, are merely travelling cloaks imbued with Disillusionment Charms (DH21).
- Albus Dumbledore was able to perform a Disillusionment Charm so powerful that he did not need a Cloak to be invisible (PS12, DH22). Gellert Grindelwald was presumably able to do the same (DH35).
- Voldemort casts a Disillusionment Charm on himself to hide himself when he goes to Hogwarts to open Dumbledore's tomb, from which he takes the Elder Wand (DH24).