In a recent battle I was Dming, the party was fighting against Wraiths (in the Madness at Gardmore Abbey adventure). Wraiths have phasing and thus can fly into and through walls, so the players and I were all wondering if there are any effects that can hit a creature in a wall.
I believe that walls block line-of-effect and line-of-sight, but what does that mean for auras or other effects?
Do any effects or attack types penetrate walls without specifically stating so?
(I just realized you have to end your turn out of a wall, but some interrupts and effects could still take place while a creature was traveling through a wall)