PoE2
Concentrated Effect
Support
AoE
Requires: Level 1
Support Reqirements: +5 Int
Supports any skill with an area of effect, causing that area to be smaller but any area damage it deals to be higher.
Supported Skills deal 40% more Area Damage
Supported Skills have 50% less Area of Effect
Place into a Skill's Support Gem socket in the Skills menu to apply its effects to that Skill. You cannot have multiple copies of the same Support Gem socketed at the same time.
PoE1
Concentrated Effect Support
Support
AoE
Level: (1–20)
Cost & Reservation Multiplier: 140%
Requires: Level (18–70), (33–111) Int
Supports any skill with an area of effect, regardless of whether that skill deals damage.
Supported Skills deal (25–39)% more Area Damage
Supported Skills have 30% less Area of Effect

Additional Effects From Quality:
Supported Skills deal (0–10)% increased Area Damage
This 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 Skill Gem you wish to augment. Right click to remove from a socket.