When Durance (intelligence over 10) wants to cast "Pillars of Faith", there is no bonus area from intelligence. There is only the red area, no yellow area around it. You can only target characters, not any point on the ground.

 

All other AOE spells show the bonus area.

The spell "Pillar of Holy Fire" can be cast on any point of the ground, like most other AOE spells.

 

I assume this is a bug.

Yellow areas are not "bonus range", it is the area of a spell that does no Friendly Fire. Some spells do not have this at all.

It is mildly inconsistent, though, because some spells are "Foe AoE", but still shows a yellow area, which isn't necessary.

 

However, you're still correct. Here's a picture of Durance, Pillar of Faith, at Intellect 10 and Intellect 20:

Edited May 1, 201510 yr by Luckmann