The minds of the Slann Mage-Priests are great and deep beyond mere human comprehension. Mage-Priests communicate with each other across the globe, and possibly across space and time, by means of currents of magic which flow through the world, and can see through the eyes of other Slann or even Skink Priests if they wish.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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At the start of each friendly Magic phase, before dice are rolled to determine the strength of the Winds of Magic, you may pick two friendly Wizards with this special rule anywhere on the battlefield and they may exchange a single spell with each other. In subsequent turns, a different pairing of Wizards with this special rule may be chosen.