The Demon Ruins area is full of references to Dark Souls 1, including a number of statues and petrified Capra Demons and Taurus Demons, as well as live demonic statues and basilisks.The ballista shot can also be used to break open a wall guarding a hidden item ( Speckled Stoneplate Ring) towards the back of the level.If a ballista shot hits this stonework, it will open a permanent one way shortcut to the Old King's Antechamber Bonfire
On the opposide side of the map from the worm, there is a mound of exposed stonework.If you stand behind this small hill, you can get the worm caught in the line of fire from the ballista as it tries to shoot you. Behind the huge worm in the main area, there is a small incline in the ground.At the end of this path is a ladder that brings you up underneath the ballista. This path takes you past hound-rats, basilisks, and a great-sword wielding black knight. It can be turned off by following an underground path. Ballista shots fall from the sky in the main area.Lightning Stake (Carthus Sandworm drop).