R's attack of Hogwarts Castle

In the 1980s, R sent a message transfigured as a black quil to one of his alies, giving them the test of attacking Hogwarts School. This message was found by Ben Copper and Jacob's sibbling in the Artefact room. Jacob's sibbling immediately went to the Headmaster's office and told Professor Dumbledore and the four Heads of House about their discovery.

Shortly afterward, Penny Haywood was found unconcious on the Training Ground by Professor MacGonagall, and as brought to the Hospital Wing, where she was visited by Jacob's sibling and Nymphadora Tonks. She told her friends that she couldn't remember excact details of what had happened, but recalled a cold feeling.

Tonks and Jacob's sibling inspected the Training Grounds. There, they found out that R planned to attack Hogwarts with Dementors, When Jacob's sibbling encountered one, they were unable to defend themself. Tonks came to to help them and chased the Dementor away with her jack rabbit Patronus. Unwiling at first, she eventually agreed to teach them the complex charm.

To practise their focus, they went to Zonko's joke shop, as Tonks thought concentrationg while playing a trick was a good idea. They bought belch powder and added it to the ButterBeer at the Three Broomsticks inn. They also found a message to R, informing them of what had happened so far.

Tonks and Jacob's sibling returned to Hogwarts and started their training. They were interrupted by Merula Snyde, who also wanted to learn the charm. Tonks instructed them to go the library to study the theory of the Patronus. Afterwards, they met in the Great Hall to think about what happy memories they would use to summon their Patronuses.

When they first attempted to cast the spell on the Training grounds, nothing happened when Merula tried it and Jacob's sibling was able to conjure a non-corporeal Patronus on their first attempt. They asked Professor MacGonagall for help. After talking about what distracted their focus, Professor MacGonogall informed Jacob's sibling that Professor Dumbledore wanted to see them.

After taking adice from Professor Dunvledore, Jacob's sibbling found out that Merula had been looking for the Demmentor on her ownn without having mastered the charm. Tonks found them and informed them that the Demmentor had been seen on the Training Grounds.Merula finally admitted that she feared not be worthy to conjure a Patronus, directly before the Demmentor approached them. She was able to conjure a non-corporeal Patronus, while jacob's sibbling and Tonks conjured corporeal Patronuses.