What do the red and yellow areas for AoE spells mean?
When casting a spell with an area of effect, the targeting cursor is a red and a larger yellow circle.
What exactly do these two different circles mean? Is the effect weaker in the yellow circle?
The yellow area represents the additional area of effect granted by Intellect. The best part is that Friendly Fire cannot occur within this expanded zone, which allows you to do some very clever AE targetting and avoid hitting allies.