PoE2
Sigil of Power
Spell
AoE, Duration
Level: 20 (Max)
Cooldown Time: 10.00 sec
Cast Time: 0.60 sec
Requires: Level 90, 205 Int
Places a Sigil on the ground, providing a powerful Spell Damage Buff to you and Allies while standing in it. The Buff becomes more powerful the more mana you spend while standing in the Sigil.
Gains a Stage when you Spend a total of 50% of your Maximum Mana while in Area
Maximum 4 Stage
Buff grants 14% more Spell Damage per stage
Minimum 1 second between gaining Stages
Sigil radius is 3 metres
Sigil duration is 11.9 seconds
Skills can be managed in the Skills Panel.
PoE1
Sigil of Power
Spell
AoE, Duration, Lightning, Arcane
Level: (1–20)
Cost: (30–54) Mana
Cooldown Time: 10.00 sec
Cast Time: 0.50 sec
Requires: Level (34–70), (79–155) Int
Places a Sigil on the ground, which grants a buff to you and allies in the area around it for a duration. The Sigil gains stages as you spend mana in its area, making the buff more powerful. You can only have one Sigil of Power at a time.
Base duration is 12 seconds
Gains a Stage when you Spend a total of (72–400) Mana while in Area
Enemies in Area deal (10–19)% less Damage while at maximum Stages
Maximum 4 Stages
Buff grants (2–7) to (29–141) Added Lightning Damage per Stage
Minimum 1 second between Stages

Additional Effects From Quality:
Enemies in Area deal +(0–4)% less damage while at maximum Stages
Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.