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Slann are powerful spellcasters. In addition to all the normal spells of their lore, they all have access to the Banishment vortex spell from the Lore of Light, as well as Shield of the Old Ones and a more powerful version of Arcane Conduit. Additionally their upgrades allow them to gain regeneration, cause terror and get ward saves.
Please see the individual pages on the various kinds of Slann for more detailed information on lore and game mechanics: