Exposed Attack

"You take advantage of advantage, obviously, dealing heavy damage." -Description

Tier 1	You deal an extra Xd6 damage, where X equals half your proficiency bonus, rounded down, to one creature you hit with an attack, if you had advantage on the attack roll.
Tier 2	You deal an extra Xd6 damage, where X equals your proficiency bonus. You don't need advantage on the attack roll if another enemy of the target is within 5 feet of it, that enemy isn't incapacitated, and you don't have disadvantage on the attack roll.
Tier 3	You deal an extra Xd6 damage, where X equals your double proficiency bonus.