Projectiles have 30% chance to be able to Chain when colliding with terrain 
Ricochet is a notable Ascendancy passive skill for the Deadeye. It lets chaining skills chain one extra time and gives projectiles a chance to chain while colliding with terrain. Note that the projectile must have a chain remaining to be able to chain off of terrain.
- Ulaman's GazeUlaman's Gaze
Searching Eye JewelRequires Level 40+(10-20) to Dexterity
Projectiles have 4% chance to be able to Chain when colliding with terrain per Searching Eye Jewel affecting you, up to a maximum of 20%The Sovereign of the Well seeks dominion over the light.Place into an Abyssal Socket on an Item or into an allocated Jewel Socket on the Passive Skill Tree. Right click to remove from the Socket., which provides a similar chance for projectiles to chain off of terrain