Mothron

Type	Flying Enemy
Environment	Solar Eclipse
AI Type	Baby Mothron AI
Damage	50/100/150
Max Life	700/1400/2100
Defense	14
KB Resist	70%/73%/76%
Immune to
Hurt	https://terraria.wiki.gg/wiki/File:NPC_Hit_1.wav
Killed	https://terraria.wiki.gg/wiki/File:NPC_Killed_1.wav

Type	Enemy
Environment	Solar Eclipse
AI Type	Mothron Egg AI
Damage	0
Max Life	200
Defense	30
KB Resist	30%
Immune to
Hurt	https://terraria.wiki.gg/wiki/File:NPC_Hit_1.wav
Killed	https://terraria.wiki.gg/wiki/File:NPC_Killed_1.wav

Type	Flying Enemy
Environment	Solar Eclipse
AI Type	Mothron AI
Damage	80/160/240 (contact); 4080120 (slow charges); 100200300 (fast charges)
Max Life	6000/12000/18000
Defense	30
KB Resist	80%/82%/84%
Banner	Mothron Banner(Desktop, Console and Mobile versions)
Immune to
Coins	5 GC12 GC50 SC
Hurt	https://terraria.wiki.gg/wiki/File:NPC_Hit_44.wav
Killed	https://terraria.wiki.gg/wiki/File:NPC_Killed_46.wav
Idle	https://terraria.wiki.gg/wiki/File:Zombie_73.wav

Desktop/Console/Mobile-Only Content: This information applies only to the Desktop, Console, and Mobile versions of Terraria.

Not to be confused with Moth.

Mothron is a rare, powerful Hardmode, post-Plantera flying enemy that spawns during the Solar Eclipse event. Mothron can pass through all blocks and attacks by chasing after the player or aligning itself horizontally with them before lunging towards them at varying speeds, inflicting heavy contact damage depending on its velocity. Occasionally, it lands on blocks to lay several Mothron Eggs that spawn Baby Mothrons if they are not destroyed in time, much like Lepus(3DS version).

It is one of the few entities that can be detected by the Lifeform Analyzer or its upgrades. Mothron requires 25 kills to be awarded completion of its Bestiary entry and corresponding banner, as opposed to the usual 50 kills.

Notes

Be careful not to let Mothron lay its eggs on a single block in the air as sometimes it can despawn without dropping anything.
Three of Mothron's drops, the Mothron Wings, The Eye of Cthulhu, and the Broken Hero Sword, explicitly require that all three mechanical bosses have been defeated.^[1] This is always the case in regular gameplay, since it is a prerequisite to fighting Plantera and Mothron, but if Mothron is encountered earlier because of mods or other third-party tools, then it will not drop these items.
- The Mothron Wings and The Eye of Cthulhu furthermore also explicitly require that Plantera has been defeated.

Tips

Mothron is most vulnerable when laying its eggs, as it remains completely motionless for a few seconds.
When dashing, it is vulnerable to more damage as it rams into the player's projectiles rapidly. Weapons like the Crystal Serpent especially benefit from this.
Mothron Eggs should be destroyed before they hatch, as Baby Mothrons interfere with the fight and drop no loot.
Mothron is best fought in an open, flat arena. Wings or the Gelatinous Pillion help with vertical mobility for dodging the ram attacks.
- Another possible approach is jumping down a long shaft, such as a hellevator, and shooting up.
Viable armor choices for fighting Mothron include Hallowed armor, Chlorophyte armor, or Shroomite armor. Melee players should equip Turtle armor or Beetle armor, as their high defense stats can allow them to shrug off a lot of damage from Mothron's charge attacks.
Ranged and magic weapons are ideal against Mothron. The Piranha Gun is exceptional and allows defeating Mothron in 20–25 / 40–45 seconds; other good ranged options are the Venus Magnum, Snowman Cannon, Chain Gun, and Tsunami. Good magic options include the Blizzard Staff, Razorblade Typhoon, Nightglow, Stellar Tune, and the Crystal Serpent due to its splash projectiles.
Melee users can use the Death Sickle to great effect (provided they have obtained one from the Solar Eclipse already), as it can continuously deal damage while Mothron lays eggs and keeps it at bay for a few seconds. Other strong options include yoyos, the Scourge of the Corruptor, Vampire Knives, True Night's Edge, and True Excalibur. Flasks such as the Flask of Venom or Flask of Ichor help immensely.

Trivia

Mothron is a reference to Mothra from the 1961 Japanese kaiju film Mothra.^[2] The subtle change in its name follows the trend of Terraria enemies' and bosses' names ending with the suffix -ron, such as Skeletron, Duke Fishron, and Pigron.
If the Eclipse finishes, or all players die, Mothron floats up to the sky, vertically upwards, and despawns, similar to the Martian Saucer and Pumpkin/Frost Moon event bosses. In addition, it becomes invincible after the end of the Eclipse.
Similar to the Ice Golem, Sand Elemental, and the Dreadnautilus, Mothron is not a boss or mini-boss even though it has stats comparable to a boss. This is evidenced by its lack of a boss health bar, the fact that it drops a banner, not a trophy, and the fact that it does not drop a relic in Master Mode.
Technically, Baby Mothrons should be in their larval state at birth.
Mothron acts similarly to Lepus(3DS version), in the sense that it lays eggs that spawn weaker versions of itself.
Grox The Great presumes that Mothron drops the Broken Hero Sword because it ate the sword.^[3]

Bestiary entries

Mothron: "A behemoth of an insect attracted to the eerie anti-glow of a solar eclipse. With a rapid gestation period, it multiplies quickly."
Baby Mothron: "The creatures which burst from the eggs laid by mothron can be as deadly and as relentless as their daunting mothers."