Primal Size

A primal druid adds enlarge person to her list of class spells. She can also channel stored spell energy to cast this spell without preparing it — she can lose a prepared spell of 1st level or higher to cast enlarge person. At 8th level, if a primal druid casts enlarge person on himself, he gains +4 size bonus to Strength and Constitution instead of the usual bonuses. At 16th level, if a primal druid casts enlarge person on himself, he increases by two size categories and gains +6 size bonus to Strength and Constitution instead of the usual bonuses.