Your spells can affect a target even if you no longer have line of effect to it.
Benefit: You can affect a target to which you no longer have a direct line of effect, as long as the target is within the spell’s maximum range and it was within your line of effect within a number of rounds equal to your Intelligence modifier. The target gains a bonus to any saving throws against the modified spell equal to the number of rounds since you had line of effect. Spells modified with this feat provide no knowledge as to the target’s current location. This feat cannot be applied to spells that require a melee or ranged touch attack or are area effect spells. A blind targeted spell uses up a spell slot one level higher than the spell’s actual level.
Shadowsfall: Shadow Plane Player’s Companion © 2012, Jon Brazer Enterprises; Author Dale C. McCoy, Jr.