While vicars are experts of a single sphere of influence, divine sages are the masters of many.
Favored Sphere’s (Ex)
At 1st level, a divine sage must select one of his deity’s spheres of influence. This sphere is considered his primary sphere (see Spheres of Influence). The divine sage gains the bonus feat and adds the listed skills from his chosen sphere to his list of class skills. He also gains a +2 bonus on check of those skills granted by his 1st favored sphere. At 7th level and every six levels thereafter, the divine sage may select an additional favored sphere. In addition, at each such interval, the skill bonus to the skills granted in any one favored sphere (including the one just selected, if so desired), increases by +2. If a specific skill is granted in more than one favored sphere, the divine sage’s bonuses do not stack; he simply uses whichever bonus is higher. This ability alters spheres of influence, and replaces sphere powers gained at 7th, 13th, and 19th level.
Sphere Channeling (Su)
The divine sage gains greater knowledge and understanding of his deity's spheres of influence. At 1st level, a divine sage learns to channel the power of his 1st favored sphere (see Sphere Channeling Powers). As he gains access to his 2nd, 3rd, and 4th favored spheres, he can channel the powers associated with these spheres. At the beginning of each day, the divine sage must select one of his favored spheres, and once chosen it cannot be changed. He then gains that sphere's channeling power until the next time he regains his spells, at which time he can select a different favored sphere, or the same one. Using this ability expends one use of the divine sage's divine reservoir. This ability can be used a number of times per day equal to 3 + his Charisma modifier.
In addition, any channeling feats gained by the divine sage at 1st level, whether through his sphere's granted powers or this ability, can be used when using a sphere channeling power. This ability otherwise functions as or replaces the vicar's channel energy ability.
Spell Kenning (Su)
At 4th level, a divine sage is learned in the magic of other divine spellcasters, and can use his own magic to duplicate those classes’ spells. Once per day, a divine sage can cast any spell on the cleric/oracle, druid, or shaman spell list as if it were one of his divine sage spells, expending a divine sage prepared spell slot of the same spell level to cast the desired spell. Casting a spell with spell kenning always has a minimum casting time of 1 full round, regardless of the casting time of the spell. At 10th level, a divine sage can use this ability twice per day. At 17th level, he can use this ability three times per day.
Table: Divine Sage