Terraria 1.4: How to get the Zenith

You need:

• Terra Blade
• Meowmere
• Star Wrath
• Influx Waver
• The Horseman´s Blade
• Seedler
• Starfury
• Bee Keeper
• Enchanted Sword
• Copper Shortsword
• Orichalcum/Mythril Anvil

To craft the Terra Blade you need:

• True Excalibur
• True Night’s Edge

To craft True Excalibur you need:

• Excalibur – 12 hallowed bars (Hallowed bars are dropped from mechanical bosses)
• Broken Hero Sword – Obtained during the Solar Eclipse Event

To craft True Night’s Edge you need:

• Night’s Edge
• Broken Hero Sword

To get Night’s Edge you need:

• Blood Butcherer / Light´s Bane
• Muramasa – Found in Dugeon Chests
• Blade of Grass – 12 Jungle Spores, 12 stingers
• Fiery Greatsword

Now combine True Excalibur and True Night’s Edge in an Orichalcum/Mythril Anvil

The Meowmere has an 11.11% chance to drop from Moon Lord (Last Boss of the game)

This Sword too has an 11.11% chance to drop from the Moon Lord

The Influx Waver has an 11.11% chance to drop from Martian Saucer during the Martian Madness Event, which happens randomly

The Horseman’s Blade has a 12.5% chance to drop from any Pumpkin Moon Boss. Pumpkin Moon is a Halloween Boss. You can only get it’s spawn item on Halloween.

The Seedler has a 14.29% chance to be dropped by Plantera.

The Starfury can be found in Skyware chests or Skycrates on the floating island.

The Bee Keeper has a 33% chance to be dropped from Queen Bee

You need to find this thing (on the right) in either a cave or a macaroni shaped cave

Macaroni Shaped Cave photo below:

You need 7 Copper Bars for this. You also get it on the beginning of the game.

To craft the Orichalcum Anvil you need:

• Either an Iron Anvil or a Lead Anvil
• Either 10 Mythril bars or 12 Orichalcum bars

You have gathered all of these swords and now you are ready!

Now:
Go to your Mythril/Orichalcum Anvil (or higher level anvils if you have them)
Make sure you have all of the swords in your inventory:

Now craft it!