In current Desktop, Console, and Mobile versions of Terraria, defeat Plantera, then find a Solar Eclipse: Mothron can spawn during that event. You can wait for an eclipse to occur naturally or summon one with a Solar Tablet. The eclipse’s own progression requirement is earlier than Mothron’s, so triggering the event before defeating Plantera will not make Mothron eligible to appear.
What you need to do
- Defeat Plantera. In the current listed Desktop, Console, and Mobile versions, Mothron is a post-Plantera enemy. The rule changed in Desktop version 1.4.1; earlier Desktop versions placed its spawn gate after all three mechanical bosses. Official Terraria Wiki: Mothron
- Start or wait for a Solar Eclipse. Solar Eclipses can occur naturally at dawn in Hardmode once at least one mechanical boss has been defeated, or you can summon one with a Solar Tablet. Official Terraria Wiki: Solar Eclipse
- Stay active during the event. Mothron is a rare Solar Eclipse enemy, so it may take time to appear. Continue fighting through the event and watch for it.
Why the boss and event requirements differ
A Solar Eclipse can become possible after defeating one mechanical boss, but Mothron’s current spawn condition is stricter: Plantera must also be defeated. Therefore, an eclipse can happen before Mothron is eligible to spawn.
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For a natural eclipse, the wiki lists a 1-in-20 (5%) chance at a particular dawn once the event’s mechanical-boss requirement has been met. This is a per-dawn chance, not a guarantee that an eclipse will happen on the next morning. A Solar Tablet lets you summon the event rather than waiting for that chance.
Farming Mothron for a Broken Hero Sword
If you are hunting a Broken Hero Sword, defeating Mothron is not a guaranteed drop. The Official Terraria Wiki lists a 25% drop chance in Classic and 43.75% in Expert, and says the drop requires all three mechanical bosses to have been defeated. Those drop figures are based on Desktop 1.4.4.9 source code; the wiki page identified Desktop 1.4.5.8 as current when crawled. Official Terraria Wiki: Broken Hero Sword
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- Create the farm of your dreams: build your farm from the ground up on 1 of 5 map layouts suited to your play style!
- mmaster your branching skills: raise animals, grow crops, start an orchard and build useful machines!
- become a part of the local community: get to know all 30+ residents of Pelican town!
- customize your farmer: there are hundreds of character customization options to choose from!
- settle down and start a family: share life on the farm with 1 of 12 characters you can date and marry, and even have children with!.explore vast, mysterious caves! Encounter dangerous monsters and valuable treasures!.spend a relaxing afternoon at one of the local fishing spots: the waters are teeming with seasonal varieties of delicious fish. Craft bait, bobbers, and crab pots to help you in your journey toward catching every fish and becoming a local Legend!.
The three-mechanical-boss requirement for the sword drop is separate from Mothron’s current post-Plantera spawn gate. If Mothron appears but the three bosses have not all been defeated, the Broken Hero Sword will not drop.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Version caveat
The current guidance above applies to Desktop, Console, and Mobile information on the cited wiki pages. Desktop 1.4.1 changed Mothron’s progression requirement from all three mechanical bosses to Plantera. Do not assume that same rule applies to every earlier console edition or the 3DS version; consult documentation for the specific platform and version you play.
Quick Recap
Rank #2
- Capture and Tame Dinosaurs: Discover over 100 different dinosaurs and prehistoric creatures on the island, finding ways to tame them into useful additions for your tribe's dyno herd
- Survive Above All: Hunger, thirst, basic safety, and protecting yourself from the weather are all part of the game
- Harvest, Hunt and Build: Cut down trees and turn them into a basic home, which you can quickly expand into a Jurassic estate. Hunt for meat, scavenge for plants (or start your own garden!)
- Customize Everything: An extensive crafting system invites you to mix and match materials scavenged from the island, while also modifying the colors, textures, shapes, and styles
- Explore the Island: Solve the mystery of The ARK as you explore this massive island, discovering Explorer's Notebooks (filled with clues!) throughout
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