Fork (Projectiles)

Fork splits a shot into more projectiles when it hits an enemy. The new projectiles fly on to other enemies for part of the damage.

Where it comes from

Source	Weapon	What it does
Split Arrow	Bow	On hit, the arrow splits into 2 arrows that fly at nearby enemies, 60% damage each
Some unique jewels	Bow or wand	Read the jewel once identified

Forked projectiles can't fork again.
They never hit an enemy the shot already hit. Against a lone target, such as a boss with no adds, a fork does nothing.
Split Arrow children aim at the nearest other enemies within 8 blocks, and share the crit and proc result of the arrow they came from.
On a bow, Split Arrow works on every enemy the arrow hits, including the ones it pierces.
A forked projectile keeps any Chain the shot had left.

When a shot hits an enemy it checks Pierce first, then Fork, then Chain. See Pierce for the full order.