Probe

The Probe is an enemy that spawns from one of The Destroyer red lit segments. It fires lasers both from inside the Destroyer and detached from its master. It can pass through blocks.

Probes will only detach from The Destroyer after it has taken a fair amount of damage.

Fighting Probes
Probes are fairly small, fast enemies that can deal consistent damage in a moderate amount of time. The best way to defeat them is to use a fast arcing weapon e.g. a broadsword or Light's Bane or better with high knockback and accessories to increase damage, melee attack speed and knockback. Other good ways are to use some ranged weapons such as a repeater or Minishark. These types of weapons allow you to kill the Probes as well as being able to deal damage to The Destroyer. It helps to use a Gravitation Potion or Rocket Boots/Spectre Boots. These allow easy movement to dodge the Probes as they come towards you and to dodge the lasers.