Celestial Resistance Aasimars have acid resistance 5, cold resistance 5, and electricity resistance 5
Heavenborn
Spell-like Ability Aasimars can use daylight once per day as a spell-like ability (caster level equal to the aasimar's class level)
Darkvision Aasimar have darkvision 60 ft. (they can see perfectly in the dark up to 60 feet.)
Cantrips A summoner learns a number of cantrips, or 0-level spells, as noted on Table: Summoner Spells Known under “Spells Known.” These spells are cast like any other spell, but they may be cast any number of times per day. Cantrips prepared using other spell slots, due to metamagic feats, for example, consume spell slots as normally.
Lesser Eidolon A master summoner’s class level is halved (minimum 1) for the purposes of determining his eidolon’s abilities, Hit Dice, evolution pool, and so on. The eidolon otherwise functions as normal.
Life Link Starting at 1st level, a summoner forms a close bond with his eidolon. Whenever the eidolon takes enough damage to send it back to its home plane, the summoner can sacrifice any number of hit points. Each hit point sacrificed in this way prevents 1 point of damage done to the eidolon. This can prevent the eidolon from being sent back to its home plane.
Summoning Mastery Starting at 1st level, a master summoner can cast summon monster I as a spell-like ability a number of times per day equal to 5 + his Charisma modifier. The summoner can use this ability when his eidolon is summoned. Only one summon monster spell may be in effect while the eidolon is summoned. If the summoner’s eidolon is not summoned, the number of creatures that can be summoned with this ability is only limited by its uses per day. This ability otherwise functions as the summoner’s normal summon monster I ability. Other than these restrictions, there is no limit to how many summon monster or gate spells the summoner can have active at one time.
Augment Summoning At 2nd level, a master summoner gains Augment Summoning as a bonus feat. He does not have to meet any requirements for this feat.