You'll need a dark wizard/death eater with the "Crucio" ability, such as Barty Crouch Jr, Tom Riddle etc. Barty Crouch Jr. can be found in a locked chest in Year four level 1, and you need to be able to open the chest.
Barty Crouch Jr.
Barty Crouch Jr is played by David Tennant.
Barty Crouch Jr costs 900,000 studs on Lego Harry Potter.
Barty Crouch Sr was murdered by his son, Barty Crouch Jr who transfigured his body into a bone and buried it in order to avoid detection. Barty Crouch Jr was given the Dementors kiss, a fate described as worse than death.
On 1 level of year 4 when the place is trashed, in one chest with a silver lock blast it and get barty crouch jr.
David tennant played Barty Crouch Jr in Harry Potter and the Goblet of Fire.
Barty Crouch Jr.
After Barty Crouch Jr. was discovered to be responsible for the events leading up to the Triwizard Tournament in "Harry Potter and the Goblet of Fire," he was confronted by his father, Barty Crouch Sr. Crouch Sr. had previously imprisoned his son for being a Death Eater, and upon finding him, he was forced to confront the reality of his son's actions. Ultimately, Crouch Jr. was killed by his father, who used the Killing Curse on him to prevent his capture and exposure. This act marked a tragic end to the story of Barty Crouch Jr. within the series.
Assuming you mean Barty Crouch Jr. - he turned his father's body into a bone after killing him and then buried the bone into Hogwarts's grounds.
Barty Crouch died because he had figured out that the "Mad-Eye" Moody that was there was really his son, Barty Crouch Jr. So barty jr. decided to kill his father so nobody else would know he was there and ruin his plan to get Harry to the graveyard for Voldemort.
Barty Crouch Jr. (who is also a Death Eater) captures Moody After his Teaching agreement at Hogwarts and Continually uses a Polyjuice potion to keep Mod-Eye's form and teach classes himself in order to get closer to Harry. As for Mad-Eye's Body-Barty Crouch Jr. puts his body in an enchanted truck that around 10-15 ft deep