Jester's Arrows are a type of arrow. They are considered an improvement over the Unholy Arrow, as they have no limit on the number of enemies they can pierce. This makes them efficient against enemies with multiple sections such as the Eater of Worlds. Due to their piercing effect, they can sometimes be better than stronger arrows, such as the Hellfire Arrow. They also emit light when fired, meaning they can be used to temporarily light up caves. However, Jester's Arrows will explode in a firework effect after hitting something or reaching their maximum range. This means that, unlike other arrows, they can not be recovered after hitting an enemy or a wall (As of 1.4, no arrows can be recovered after being fired).
Unlike other arrows, the Jester's Arrows are not affected by gravity and thus do not experience arrow drop.
Jester arrows are effective to use against segment enemies/bosses like Destroyer and Eater of Worlds.
The Jester's Arrow has a limited duration after being fired, and explodes in a shower of non-damaging sparks when time is up. Since it is based on time and not distance, the range can be extended with an Archery Potion. This effect, however, does not apply for the Magic Quiver.
Before the 1.2 update, Jester's Arrows were non-craftable, which made them the most difficult arrow to maintain a stockpile of in the game.
They are very useful for finding ores, as their sparkly explosion goes through walls. If one has a lot of stars to spend, it will be a good choice to make some of these, especially in hardmode, when some valuable ores (e.g. chlorophyte, adamantite) are difficult to see.
This also makes them good for exploring new caves, though it might take a few attempts at different locations before a cave is discovered.
However, it is more efficient to use glowsticks as Fallen Stars are scarce.
Jester's Arrows have a 10% damage penalty for every enemy hit.