The artilleryman Artificer has the ability to craft Eldritch Cannon (s). The rules for the cannon state that you can create two versions of different sizes:
You can take an action to magically create a small or small Eldritch cannon in a free space on a horizontal surface within 5 meters of you. A small Eldritch cannon takes its place and a small one can be held in one hand.
The wording is somewhat vague. The rules mean that the tiny version::
- Therefore does not take up space Got to be held in the hand of the artist
- Can In contrast to the small version, it can be held in one hand, but otherwise functions in terms of space and movement like the small version if it is not.