Mothron

Mothron is a mini boss like Wyvern and a resilient flying enemy that spawns during the Solar Eclipse event and passes through blocks. It can only spawn after all Mechanical Bosses have been defeated. Mothron attacks by lunging at the player. Occasionally it lands on blocks to lay several Mothron Eggs that will spawn Baby Mothrons if they are not destroyed in time, much like Lepus.

Tips

 * The basic steps:
 * Prepare an open, flat arena.
 * Equip a good set of wings, and either Hallowed armor with helmet (which gives a ranged bonus and ranged critical strike chance) or Chlorophyte armor with helmet (which gives a ranged bonus, and each crystal leaf projectile will deal 100 damage) or Shroomite armor. Turtle armor and Beetle armor offer more defense, but they're better suited for melee, and offer no ranged bonuses.
 * Ranged weapons are ideal. The Piranha Gun's projectile damages anything it comes in contact with while still latched to the target (victory can be achieved in 20-25 seconds in normal mode, 40-45 seconds in Expert mode). Also good choices are the Megashark and the Unholy Trident (except for its high mana cost) or for melee users, any Broken Hero Sword made weapon (Terra Blade, True Excalibur, True Night's Edge). Some prefer the yoyo.
 * Ranged damage boosting accessories (for melee users, melee boosting accessories).
 * Mothron is most vulnerable when she is laying her eggs.

Trivia

 * Mothron is a reference to Mothra from the namesake 1961 movie. 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 and despawns, similar to the Eye of Cthulhu. In addition, it becomes invincible after the end of the Eclipse.

History
Mothron