This mod changes the Graze skill in the Mastermind's Sharpshooter tree to a chaining effect, like "chain lightning" spells in different games. Any headshot on an enemy will propagate part of the damage to the closest enemy in their vicinity, which will then also pass it on.

Skill Description

BASIC: 4 points
Scoring a headshot with a Sniper Rifle deals 50% of the damage to the closest enemy in a 4m radius, chaining up to 3 times.

ACE: 8 points
Any killing headshot with a Sniper Rifle now deals 100% of the damage to enemies in the chain and the effect can now chain up to 5 times.

Thanks to Alcat101 for coming up with the new skill name!

You can also find this mod on GitHub, so if you want to help with anything, feel free to fork the project, make changes and create a pull request when you're done.