Terraria (Wiki): Yellow Phaseblade

The Yellow Phaseblade is a melee weapon that pierces enemies.

The Yellow Phaseblade's color is determined by the kind of gem used to craft it, and there are 7 (desktop, console, mobile) / 6 (3DS, old-gen consoles) different color variations with identical statistics. Since no other sword is specifically identified as a "Meteorite sword" and Meteorite Bars are required to craft it, the Phaseblade can be considered the Meteorite-tier ore sword. V 

The Yellow Phaseblade is the weaker version and one of the key components in crafting the Yellow Phasesaber. A Yellow Phaseblade cannot autoswing. Its attack reaches four tiles in radius. At an optimal distance, the Yellow Phaseblade can pierce two enemies. However, multiple bodies will be damaged should they all line up for the player.

When normally used, the Yellow Phaseblade emits light, making it suitable for exploring caves, finding ores, and lighting dark places when traveling. The Yellow Phaseblade’s attacks do not go through walls.

Combat-wise, the Yellow Phaseblade's damage output and speed make it effective against waves of enemies. All Flask items will imbue their unique effects since the Yellow Phaseblade is a melee weapon.

The Yellow Phaseblade is best modified with Legendary for overall stats improvement.