Terra Blade

The Terra Blade is a top-tier Hardmode Sword, currently with the highest base per-hit damage of any Sword in Terraria. It auto-swings, and fires a green Sword projectile that costs no Mana or Ammunition and can pierce up to three Mobs.

Its best Modifier is Legendary.

Tips

 * With a Legendary reforged Terra Blade, Fire Gauntlet, Destroyer Emblem, Avenger Emblem, Mechanical Glove, and Warrior Emblem accessories all reforged with Menacing (+4% damage), and the Well Fed, Tipsy and Flask of Ichor buffs, As well as wearing the Chlorophyte Mask, Turtle Scale Mail, and Hallowed Greaves, the Terra Blade will have a base damage of 226 melee damage, making it possible to score critical hits for 600 damage.
 * The Terra Blade deals 13 more damage than The Horseman's Blade, despite being available earlier in the game. The Horseman's Blade can attain a higher damage rate due to its pumpkins that home in on the enemy (however the pumpkins don't attack other players in PVP situations). As such, one may consider The Horseman's Blade the stronger of the two swords.