Laser Rifle

The bolt leaves the barrel weak and gains strength the further it flies, picking up damage and the ability to punch through more enemies along the way. It tops out after roughly a screen and a half of travel. Fire it at something in your face and you are using the weakest version of the weapon; back off, find a long sightline, and the exact same shot hits considerably harder. The bolt also grows visually as it goes, which is misleading, since the part that hits things stays the same size.

In a full Meteor set it costs nothing to fire, so you can hold the trigger down indefinitely. That is the whole case for it, and the timing works out neatly: it drops from the Wall of Flesh, right at the point where a lot of players are still wearing Meteor from the Space Gun. Think of it as that gun grown up, with the free-fire trick intact and a shot that rewards fighting at range instead of up close.