Projectiles apply their on-hit effects to each target they fork on or otherwise hit.
This means that if you had pierce, chain, and fork supporting the same skill, it would first pierce to it's maximum number of pierces, then fork, then chain to its maximum number of chains.
Fork has second priority for projectile behaviors, preceded by #1 pierce, and then followed by #3 chain and #4 return. Only one projectile behavior can be applied each time a projectile hits a target. A projectile can only fork once unless it is supported by the awakened fork support gem. When a projectile forks, it splits into two identical projectiles that continue travelling at 60 and -60 degree angles from the projectile's original trajectory.
