Expert Marksman

You may spend all of your Movement in a turn to instead remain perfectly steady, then you may spend your Bonus Action aiming at a target you can see within range, and your Interaction for the turn making fine tuned adjustments.

After doing so, you then gain the following benefits:

• You may spend your entire Attack Action to make a Single Ranged Attack at Advantage. While Prone, you no longer have Disadvantage when using a firearm, crossbow, or other similar ranged weapon (DM Discretion), and instead roll three d20s and take the highest result. Your range increments are doubled for this attack. You may use your Perception skill to make this attack instead of your normal ranged attack bonus.
• Your Critical Threat Range with this attack is increased by 1, and an additional at 5th (2), 11th (3), and 17th (4) levels.
• This attack adds 1 additional weapon damage dice, and an additional at 5th (2), 11th (3), and 17th (4) levels. 
• Targets hit by this attack must succeed at a Strength Saving Throw or be knocked Prone. 
• If you roll a Critical Success with this attack, the target must also succeed at a Constitution Saving Throw or be Stunned until the start of your next turn.

• You may choose not to roll at all for your attacks during your turn and instead use your Passive Perception as the total result of your To Hit for ranged attacks, if you do so, you may make the normal number of attacks during your Attack Action instead. (Compare your Passive Perception to the targets AC, if it meets or beats the number, then the target is successfully hit, these attacks cannot Critically Succeed because no d20 was rolled, but if hit the target will still need to make a Strength Saving Throw to avoid being knocked Prone.)

The DC for these effects is 8 + your Dexterity modifier + your Wisdom modifier + your Proficiency Bonus.

(Prerequisites: Proficiency in Perception)

(Requirements: Non-Thrown Ranged Weapon)