The Terra Blade is one of the greatest weapons in Terraria post-hardmode, and its rework in 1.4.4 had changed how it worked at a fundamental level. The Blade still requires crafting, but now fires massive magical arcs that require no magic or ammo, and can trivialize most enemies with ease. How to get the Terra Blade.
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Obtain the Terra Blade in Terraria
This blade doesn’t come easy; It takes a bit of work to achieve it, but it’s well worth the time invested. To progress in Terraria Hardmode, you’ll still need to eliminate these bosses, so it’s more a matter of timing than trying to cobble together the Terra Blade if.
Enter Hardmode in Terraria
In order for the Terra Blade to be craftable, the first players must switch to Hardmode. This is done by defeating the Wall of Flesh in Hell, which is summoned by throwing the voodoo doll into the lava somewhere in Hell itself. After defeating the Wall of Flesh, the world itself will undergo drastic changes: new ores will appear, enemies, bosses and mechanics for players to contend with. First you have to defeat the three mechanical bosses The Destroyer, The Twins and Skeletron Prime.
After defeating the three mechanical bosses, Plantera will appear somewhere in the jungle biome, underground. On PC, consoles, mobile versions, and via tModLoader, the Terra Blade can only be crafted after defeating Plantera. On legacy versions like 3DS and Windows Phone, it can be crafted after defeating the three mechanical bosses in Hardmode.
Craft Terra Blade
Once Plantera is defeated (start of post-Plantera Hardmode), the Broken Hero’s Sword can be obtained by killing Mothron, which appears during the Solar Eclipse event, with a 25% drop rate. Once you’ve obtained the Shattered Hero’s Blade, combine it with a True Nightblade and a True Excaliber on a Mithril Anvil to create the Terra Blade.
https://www.gamepur.com/guides/how-to-get-a-terra-blade-in-terraria How to get a Terra Blade in Terraria