What can you do with the square stone in circle Harry Potter and Order of Phoenix?

You're likely referring to the Stone of the Elder Wand, which is found within the Department of Mysteries in Harry Potter and the Order of the Phoenix. However, it's not a square stone. It's a large, black orb that's described as being "cold and heavy."

While the stone itself isn't something you can interact with, it holds the Elder Wand's core. The core is what gives the wand its immense power.

Here's what you can do with the Elder Wand:

* Perform magic: The Elder Wand is the most powerful wand ever made, capable of performing incredible feats of magic.

* Defeat other wands: The Elder Wand is said to be unbeatable in a duel.

* Control other wands: The Elder Wand's power can be passed on to another wizard or witch, but only if the owner is defeated and then wins the wand in a duel.

However, it's important to note that the Elder Wand is also cursed. Whoever possesses it is destined to experience misfortune and ultimately be defeated by someone else.

The Stone of the Elder Wand is a powerful symbol in Harry Potter, representing the ultimate power and the dangerous consequences of its pursuit.