Holy Arrow

Holy Arrows are available once Hardmode is engaged, and can be crafted from materials dropped by enemies in the surface Hallow. While lacking in direct brute power, they summon two falling stars to the point of impact. Each falling star does one-half the combined damage of the arrow and the bow used, and can additionally hit up to two enemies. Holy Arrows have a 1/6 chance to be recovered after impact.

The falling stars are similar to the Starfury's stars, and are the same type summoned by the Star Cloak. They also fall faster than the Starfury's stars. Terrain penetration stops once the stars have neared/crossed the height of the point of impact. Thereafter, they can be stopped by any solid block. The spawn point for the stars is relative to the point of impact in the same way that Starfury's effect is relative to the point where you click the mouse.

The starfall effect of these arrows makes them quite useful against bosses and other large enemies, and more specifically, The Destroyer. The stars not only deal extra damage against it, but also helps in controlling the number of Probes and other mobs that spawn.

They're still useful after Plantera/Golem Phase, since it can deal twice as much damage if all shots hit (Stars&Arrow), also at cheesing/camping Martian Saucer, even on Expert Mode.

Advantages
Some advantages the Holy Arrows have over other arrows:


 * Hellfire Arrows
 * AoE is much larger with piercing effects.
 * Can be retrieved.
 * Jester Arrows
 * Piercing effects of the stars is over a larger area.
 * Can be retrieved.
 * Crafts in more quantity than Jester Arrows. Materials are obtainable easier in Hardmode.
 * Cursed Arrows and Ichor Arrows
 * Crafting materials are obtained from surface enemies. Also easier to get.
 * All other arrows
 * Stars illuminate a large area, including through blocks and walls.
 * Arrows with stars can deal twice as much damage if lined correctly...
 * Has twice as much DPS.
 * Can reach certain unreachable enemies.

Disadvantages
Some advantages other arrows have over Holy Arrows:


 * Hellfire Arrows
 * AoE is consistent and predictable
 * May be purchased rather than requiring harvesting materials, or made Prehardmode.
 * Jester Arrows
 * Piercing effects are controllable and work in any direction
 * Can be crafted Prehardmode.
 * Cursed Arrows
 * Deals 4 more direct damage (doesn't really matter)
 * Inflicts Cursed Inferno Debuff, dealing extra damage over time
 * Ichor Arrows
 * Deals 3 more direct damage (Doesn't really matter)
 * Inflicts Ichor Debuff, reducing the target's defense
 * Luminite Arrows
 * Deal more raw damage
 * Afterimages are easier to control, and is also making same damage as arrows.