This replaces the spells class feature.
Spell Pool: The sphere summoner gains a small reservoir of energy he can call on to create truly wondrous effects, called a spell pool. This pool contains a number of spell points equal to his level + her Charisma modifier (minimum: 1). This pool replenishes once per day after roughly 8 hours of rest.
Magic Talents: A sphere summoner gains a magic talent every time he gains a caster level. This does not stack with caster levels gained from other sources.
Eidolon: A sphere summoner gains the Conjuration sphere as a bonus sphere at 1st level, and uses his class level as his caster level for this sphere. This stacks normally with caster levels gained from other sources.
In addition, the sphere summoner must designate one of his companions as his ‘eidolon’. An eidolon is a companion with which the summoner possesses a unique connection, and many of his class features and abilities directly affect this particular companion.
Summon Mastery (Su): The sphere summoner gains a bonus magic talent drawn from the Conjuration sphere at 1st level and every odd level thereafter.
This replaces Summon Monster I, II, III, IV, V, VI, VII, VIII, IX, and Gate.
Aspect (Su): At 10th level, whenever the sphere summoner rests to regain spell points, he may choose to divert one (form) talent possessed by his eidolon, instead gaining its benefits himself.
This modifies aspect.
Greater Aspect (Su): At 18th level, whenever the sphere summoner rests to regain spell points, he may choose to divert up to two (form) talents to himself instead of only one.
This modifies greater aspect.
Recommended Casting Tradition: The classic feel of the summoner can be recreated through taking the traditional magic casting tradition.