This energy blaster looks impressive, but actually has no impact on our world. Rather, it creates a stream of neutrons that attracts spirits. Ghosts can't escape the beam. Which reminds me: Don't ever cross your beam with somebody else's! That would be bad.
The Neutron Gun was introduced in the B.O.O update at 15th July 2016. The Neutron Gun is a hand item used to hunt ghosts. Can only be used with a Neutron Pack.
It looks like Growtopia is under siege by the ghosts! Well, Battlers of the Otherworldly are hiring! You'll have to earn your uniform, but this pack includes all the tools you need to actually capture ghosts! You also get Rare Spectral Goggles (all the better to see them with!), a Neutron Gun and a Neutron Pack to corral the ghosts, and a set of 10 Ghosts Jars to catch them in.