20% increased Area of Effect 
Impact is a notable Ascendancy passive skill for the Slayer that grants single-target melee attacks an area of effect around the target, like Melee Splash SupportMelee Splash SupportSupport, Melee, Attack, AoE
Mana Multiplier: 160%Requires Level 8Supports single-target melee attack skills, causing their melee strike to deal splash damage around the target.Per 1% Quality:
Supported Skills have 0.5% increased Area of EffectSupported Skills deal (35-26)% less Damage to surrounding targets
Supported Skills deal Splash Damage to surrounding targets
Supported Skills have (0-57)% more Melee Splash Area of EffectThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.. The base radius for splashing melee attacks is 14. It also grants increased area of effect skills.
- Mark_GGG (March 28, 2016). "Slayer - Impact". Official Path of Exile Forums. Retrieved June 1, 2016.