Marble Dropper

The Marble Dropper is a Hard Mode enemy that starts spawning in the Marble Biome once the Wall of Flesh is defeated. It looks somewhat similar to a Granite Elemental, except it has a differing structure and does not have the circling rocks. It slowly moves to the player. If the player goes very near to the Marble Dropper, it shoots projectiles downwards. On impact with blocks, these projectiles will break. It takes a small break before shooting another projectile downwards so the player can quickly move to the other side. The player can also jump above them to get past, however this is difficult as if the player gets too close and tries to jump the Marble Dropper will fly over to the player at a similar speed to the player's jump speed (albeit a bit slower), making it an almost guaranteed hit.

If the player gets too far away, it starts shooting red projectiles which are more square-shaped than the ones it shoots downwards (but still not completely square). On impact with blocks, these projectiles convert into a Marble Block. Rarely, they become a Smooth Marble Block instead, and even rarer is that nothing will happen.

Only 2 of these can be on screen at once, and their AI prevents them from going too close to each other. This is to balance it so it isn't too difficult to get past the enemy when it's in groups.