Four Leaf Clover

Four Leaf Clover is a perk in Fallout 4.

Effects
The first rank of Four Leaf Clover adds a 7.5% chance of earning a critical for every shot in vats. For every rank after that it adds an extra 2%. This amounts to a total of 13.5% after all ranks of Four Leaf Clover have been taken.

Behind the scenes

 * Vault Boy's outfit and fighting stance in the perk icon are a reference to the University of Notre Dame's mascot, the Fighting Irish