Arcane Expanse

Spell Skills have 20% increased Area of Effect [1]

Arcane Expanse is a notable passive skill that grants increased Area of Effect for Spell Skills.

Anointment

Blight anointment to unlock the passive:

Oil #1	Oil #2	Oil #3	Outcome
Crimson Oil	Crimson Oil	Golden Oil	Arcane Expanse	Spell Skills have 20% increased Area of Effect

Version	Changes
3.16.0	(Undocumented): Now grants Spell Skills have 20% increased Area of Effect (up from 10%). No longers grants 15% increased Spell Damage, 10% increased Area of Effect if you've Killed Recently, or +10 to Intelligence.
3.6.0	Introduced to the game.