The Noxus Sprayer is creative-exclusive (and only functions in creative), for the obvious reason of it being able to do game breaking things, such as killing things that even are immune to all forms of damage (ex: things with resistance 255)
this add-on was made so it would be easier to test out mobs you make or if you do not make add-ons, test out add-ons that have other mobs in them, no matter what it is, as long as its an entity it will immediately despawn on contact with the spray the item produces.
<mark class="pen-red">No entity made no matter what can resist the Noxus Sprayer</mark>
gif of the Noxus Sprayer erasing a wither in its spawn animation
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