Colour out of space aura

[Charles Gouraud]

I'm running Iron Gods right now, and my players are about to enter the 4th book, which includes an area with a color out of space. I was wondering if a color out of space's aura will penetrate a wall that it's not in, because the aura says that it will work even if the creature is in the wall, but I don't know if that extends to the color's aura just going through the wall. This is relevant, because if the aura does go through the wall, then as long as my players are on the map, they need to make a save against the aura.

[voideternal]

My understanding is that the colour's aura penetrates walls. Usually, auras require line of effect, but the colour's aura specifically does not.

[Charles Gouraud]

I think what I'll do for this, unless I hear otherwise, is have the aura function like the aura of magic on a detected item, so blocked by the rock that the color is inside of.