PoE2
Spell Echo
Support
Spell, AoE
Tier: 2
Cost Multiplier: 150%
Requires: Level 1
Support Reqirements: +5 Int
Supports Spells that affect an area around you or a target location. Supported Spells echo, causing their effects to happen again after a short delay. Cannot support Channelling skills or Remote skills.
Supported Spells Echo once
Supported Skills have 30% less Cast Speed
Echoes from supported Spells have 30% more 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
Spell Echo Support
Spell
Support
Level: (1–20)
Cost & Reservation Multiplier: 150%
Requires: Level (38–70), (63–111) Int
Supports spell skills, making them repeat when cast. Cannot support Vaal skills, totem skills, channelling skills, triggered skills, instant skills, retaliation skills, blink skills, or skills with a reservation.
Supported Skills deal 10% less Damage
Supported Skills Repeat an additional time
Supported Skills have (40–54)% more Cast Speed

Additional Effects From Quality:
Supported Skills deal (0–10)% increased Spell 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.