Hogwarts Legacy - How To Capture Beasts For Your Vivarium

gamespot.com:

The Wizarding World is filled with all sorts of magical creatures and, in Hogwarts Legacy, you'll encounter a lot of them. Eventually, you'll unlock a means of taming those that are found in the wild. Here's our Hogwarts Legacy Beasts guide to help you capture animals for your Vivarium in the Room of Requirement.

The Vivarium and Beast capture mechanics in Hogwarts Legacy become available halfway through the campaign. Once you've finished a main quest called Percival Rackham's Trial, a few more will appear:

Once you've done the above, you should receive a main quest called The Elf, the Nab-Sack, and the Loom. This is the part where you're taught how to capture Beasts in Hogwarts Legacy.

Deek the house elf will show you the ropes, providing you with a spell called the Nab-Sack. Here's the gist:

The Elf, the Nab-Sack, and the Loom quest only has you dealing with tame pets like the Puffskein, Jobberknoll, and Mooncalf. However, there are more Beasts that you can capture in Hogwarts Legacy. If you check the map, you'll see animal paw icons representing the Beast Dens of different species. These include rarer creatures like the Unicorn and Hippogriff.

Upon completing your initial objectives, return to the Room of Requirement. This is when you'll unlock the Vivarium in Hogwarts Legacy, a sanctuary for all the Beasts that you've captured.

You can release your captured animals here, but there are some caveats:

Now that you have a Vivarium in Hogwarts Legacy, you'll be able to pet and feed animals (similar to what you did during the Beast Class quest). Use your brush and give them treats. This will cause them to leave droppings materials that can be used for gear upgrades and traits/perks.

Here are some additional details:

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