Zenith

The Zenith is a Hardmode, post-Moon Lord, auto swinging, block piercing melee weapon that is crafted using a variety of swords from across the game progression.

Using it will cause the Zenith and one other sword, including but not limited to its component swords (including the components of the Terra Blade, as well as swords not included in crafting, such as the Arkhalis and Terragrim) to boomerang towards enemies within a 20-block radius of the cursor and back in large arcing motions. This attack will pass through solid blocks, and two swords will appear per use. All these swords do the full damage of the weapon. The Zenith has the most complex crafting tree in Terraria, using 17 different base items (10 crafting operations), beating the Cell Phone which uses 13 items and the Ankh Shield which uses 11.

The Zenith can be considered an endgame upgrade to the Arkhalis or Terragrim (though it uses neither in its crafting recipe).

Trivia

 * A zenith is the highest point of a celestial body relative to the observer, in other words when it is directly overhead.
 * "Zenith" can also mean the point where something is at its most powerful or successful, alluding to the method of obtaining the weapon.
 * It has the most complex and largest crafting tree of any sword in the game with a total of 14 different swords, beating the Terra Blade, which is one of its ingredients.
 * The Zenith's incredible damage and DPS makes it compete against the Last Prism for the highest overall in the game.
 * Before the release of 1.4, the sword had a place holder name of "Final Fractal", it was also referred to as the "Summit" by Redigit on the Terraria Discord, and was even debated on being named "Journey's End".
 * Both the "True" and normal variants of the Excalibur and Night's Edge can appear when the Zenith is swung, along with all of the component swords of the Night's Edge, including the Light's Bane and Blood Butcherer, regardless of which was used in crafting. Curiously the Terragrim can also appear, despite not being anywhere in the Zenith's crafting tree.
 * It is the only item which requires a Copper item that can't be substituted with a Tin equivalent.