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Benefit

You can use your paladin and ranger spell slots to prepare wizard spells. You must have a minimum Intelligence score of 10 + the spell's level to prepare it, and the save DC of the spell is equal to 10 + your Int modifi er (as if you were a wizard). These wizard spells can be taken either from your spellbook (if you have one) or from another character's spellbook (though in the latter case you must decipher the writing in the book and succeed on a Spellcraft check to prepare the spell, just as a wizard using a borrowed spellbook; see Wizard Spells and Borrowed Spellbooks, page 178 of the Player's Handbook, for details). If you also have levels in wizard, your wizard caster level is treated as the sum of your wizard, paladin, and ranger class levels.

Special

Azuth has a paladin order called the Swords of the High One. Mystra has a paladin order called the Knights of the Mystic Fire and a closely allied group of rangers called the Order of the Shooting Star. Members of all three of these groups can select this feat as long as they are at least 4th level in their respective order's primary class.