Unobstruction

The next time you cast a spell, make an attack, or use an ability that requires you to see the target during this spell's duration you can, for a few seconds, see through any obstructions preventing line of sight. This includes stone  walls up to 5 ft thick, smoke or fog of any thickness, lead walls up to 1ft thick, or creatures up to huge. This spell only grants the ability to see through physical obstructions, it does grant anything the ability to move through them. Alternatively you can trigger this spell at will on the start of your turn during the duration.