This weapon is found only in the Desktop and Console version(s) of Terraria.
The Influx Waver is a sword that is dropped by a Martian Saucer from the Martian Madness event. Very much like the Terra Blade, it will send out projectiles shaped like swords. When the projectiles hit the target, the target will be hit multiple times by the same projectile in a poison-like manner until the duration ends or it is dead. It shoots particles like the Terra blade, but the Influx Waver actually shoots particles of a sword that bounces off of walls. The projectiles and the sword itself does the same damage.
The highest prefix is Legendary
This weapon could be considered as an upgrade of the Beam Sword, as its mechanics are very similar.