Not to be confused with the Martian Probe, the post-Golem enemy that triggers the Martian Madness event.
The Probe is a Hardmodeenemy which is spawned by The Destroyer. When a part of The Destroyer's body is damaged, there is a 4*1/25 (4%) chance that a Probe is spawned from it. Probes can move through blocks and attack by firing Pink Lasers.
Probes make fighting The Destroyer an easier and harder task at the same time – the Hearts they drop will keep the player alive, but they are a major source of damage during the boss fight.
Despite their appearances, the lasers that the probes fire begin from slightly above their centerpoint.
Tips[]
Probes are fairly small, fast, flying enemies who can deal consistent damage in a moderate amount of time. As such, most ranged weapons are superior to melee weapons in general. Any fast firing weapon such as the Crystal Storm will prove effective as well.
It helps to use a Gravitation Potion or Rocket Boots or one of its upgrades. These allow easy movement to dodge the Probes as they come towards the player and to dodge the lasers.
Trivia[]
The Bestiary entry for the Probe: "A singular probe detached from the Destroyer's body serves as a remote laser battery, often in a swarm of other probes."
↑Information taken from the PC1.4.1.2 source code, method AI_005_EaterOfSouls() in Terraria.NPC.cs. There may be inaccuracies, as the current PC version is 1.4.4.9.