Piercing Bolts are a type of Ammunition in Horizon Forbidden West compatible with certain Boltblasters. They deal low to medium Impact damage on impact.
While individual bolts deal little damage compared to arrows, they are fired in bursts of six bolts, potentially allowing for a higher damage output. All Boltblasters are capable of overdrawn shots, which can also increase their potential damage output.
A unique characteristic of this ammo type is its ability to pass through targets, allowing it to penetrate armor and damage targets behind it. It also has a reduced damage penalty from hitting armor compared to other ammo types (20% vs 80%, and 60% vs 95% for Apex machines).