Slann remain in constant communication with their brethren, and can see through the eyes of other Slann or even Skink Priests if they wish. For spell casting, the Slann is considered to be able to draw a line of sight to everything that any Skink Priests or other Slann on the table can see. Note that it is still the Slann that casts the spell, and range is measured from the Slann itself, ignoring any intervening terrain. Eg, a Slann in the second rank of a unit of Saurus Warriors that are engaged in combat may cast magic missiles at a foe (even though the Slann itself cannot see them) that a friendly Skink Priest can see, so long as the target is within range of the Slann.