Cantrips, Eidolon: Duh
Life Link (Su): 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, as a free action, 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.
In addition, the eidolon and the summoner must remain within 100 feet of one another for the eidolon to remain at full strength. If the eidolon is beyond 100 feet but closer than 1,000 feet, its current and maximum hit point totals are reduced by 50%. If the eidolon is more than 1,000 feet away but closer than 10,000 feet, its current and maximum hit point totals are reduced by 75%. If the eidolon is more than 10,000 feet away, it is immediately returned to its home plane. Current hit points lost in this way are not restored when the eidolon gets closer to its summoner, but its maximum hit point total does return to normal.
Blood Feast (Su): At 1st level, a blood god disciple can feed a recently fallen foe to his eidolon, allowing the outsider to channel some of its power into the summoner. The eidolon must spend a standard action to eat some of the opponent, which must be a living, corporeal creature killed or knocked unconscious by the eidolon or summoner in the past minute. This eating deals damage to the target as if the eidolon had attacked it with one natural attack (typically a bite). The fallen creature must have at least half as many Hit Dice as the summoner. Once the feeding is complete, the summoner may manifest one 1-point evolution. This lasts for 1 minute. The evolution's effects use the summoner's Hit Dice and ability scores rather than the eidolon's. The blood god disciple can use this ability a number of times per day equal to 3 + his Charisma modifier. He may only apply one use of this ability at a time (using it a second time replaces any evolution manifested with this ability), and can only manifest evolutions his eidolon has.
At 5th level, when the blood god disciple uses blood feast, he may manifest one 2-point evolution instead of a 1-point evolution. At 9th level, he may manifest up to two evolutions worth a total of 3 evolution points or fewer. At 13th level, he may manifest up to two evolutions worth a total of 4 evolution points or fewer. At 17th level, he may manifest up to three evolutions worth a total of 5 evolution points or fewer.