In Diablo II Resurrected, Demon Machine is part of the Chu-Ko-Nu category and one of many unique Crosbows in D2R. It is a relatively big item, taking 6 Blocks of space if you want to store it in the inventory or stash. Your character needs to reach at least the Required Level of 49 to carry this item. This Chu-Ko-Nu has a Strength Requirement of 80 before it can be used. Another limitation is Dexterity, which should be 95 as the very minimum.
Please note that this Weapon is Two-Handed, so your character can not use an additional weapon or shield at the same time. You also need to be carrying Bolts in order to shoot this one.
The Chu-Ko-Nu is the exceptional version of this Crossbow. It can be upgraded to the elite version by putting it into the Horadric Cube. After hitting the transmute button it will be called Demon Crossbow. The most basic (normal) version is called Repeating Crossbow.
Below is a list of variations we can get for you from our network of trusted trade partners: