You'll be climbing the battlements in Hogwarts Legacy for the High Wall mission. That is if you can work out how, as this is one of those sections where you can get stuck for no good reason, largely from bad luck and unclear direction. I got incredibly stuck on it because it felt nothing I tried worked. However, it should be, and is, easy. Eventually.
The High Wall mission sees you meet Natty at Falbarton Castle to the east of Hogsmeade. One of the first parts of the quest is to climb the battlements. The tricky part comes when you reach a wall that's to high to climb and you can't use your broom. Instead, you'll need to utilize a box and a bit of Leviosa magic. Assuming the position and physics lets you.
When you're facing the seemingly insurmountable wall, turn to the left and you'll see a portcullis with a box behind it, and a spinner to the left. Use Depulso on the switch and the portcullis will slide open and then you can use Accio to grab the box.
Once the box is free, take it and position it underneath the high wall. Use Wingardium Leviosa to raise it up and then climb on top of it. Now, for me, that didn't work immediately - so you can also stand on the box and then use Leviosa to raise it up with you on it.
However it works, the raised box will give you bridge you need to climb up to the higher level. After that, the rest of the High Keep mission is relatively straightforward, and will actually get you access to Hogwarts Legacy mounts at the end too.
The release of Hogwarts Legacy has been the subject of criticism and debate due to J.K. Rowling’s public stance on gender identity, which continues to challenge the inclusivity at the heart of the Harry Potter community. Here is our explainer on the Hogwarts Legacy controversy (opens in new tab).
