Brick is a character often overlooked in the fandom. They were the love interest of Jason Grace. Jason fell hard for Brick (heheh) but their relationship wasn't continued. Brick is actually one of the most powerful characters in the Riordanverse. In this post, I will be detailing it's durability, strength, and more.
"Jason tried to shield Piper, but a brick caught him above the eye. He crumpled..." (Mark of Athena).
As seen here, Brick completely knocked out Jason.
Here's Jason's durability: "Ephialtes kicked him backward"
Jason tanks a kick from a giant who "That old stunt we pulled, for instance, when we piles up mountains to reach Olympus-"
So tired Jason + mountain lifting giant's kick= not too much damage but relatively healthy Jason + Brick equals K.O
So Brick's striking strength is around large mountain level
If you punch something really tough at full force, your hand will break. Brick hit Jason (mountain level durability) with enough force to knock him out and suffered no damage. Brick's durability is Large Mountain level.
Brick managed to hit Jason who : "The second spirit let loose a bolt of lightning, but Jason’s blade absorbed the charge." can react to lightning and deflect it. Lightning travels 224,000 miles per hour so Brick scales above that at around 250, 000 miles per hour which is over 3,700 miles per second.
As you can see, Brick is easily one of the strongest characters in the Rirodanverse and super underrated