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Martian Probe

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v399Martian Probe
NPC 399   NPC 399 active
The inactive (searching) and active (detected) sprites.
Type Monster
Sub Type Scout
Rarity Rare
HP 500 Heart
Attack 5 (Touch)
Defense 5
Spawn Time Pwnhammer Icon (Hard Mode)
Sun Moon CharmNew (Anytime)
Spawn Area Surface (Anywhere)
Immune To None

The Martian Probe is a rare Hardmode, post-Golem enemy that is similar in function to the Goblin Scout, in that interacting with it leads to the Martian Madness invasion event starting. If you are "detected" by this NPC (in other words, getting too close to its scanner) and it is allowed to fly off-screen, the Martian Madness invasion will occur shortly there after. It does not drop anything, including coins. Martian Probes are more likely to spawn in the Space Layer or if there's a Solar Eclipse happening.

Martian Probes will typically not spawn within the inner two-thirds of the map. This makes the Space layer and the Ocean biome the ideal locations for trying to find them. Players combining Battle Potion, Water Candle, and the Space layer above or near the Ocean are most likely to find a Martian Probe. Additionally, immediately after a Martian Invasion, there appears to be a greatly increased chance of spawning the Probe, allowing the event to be chained. The probe can not spawn if there is any of the Celestial Pillars active in the world.

Regardless of where the Probe is encountered, the Invasion (like other Invasion events) will always take place around your Town NPCs.

Update Info


  • Added to the game.

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