Couple Comparisons:
Races of Faerun:
Improved Energy Resistance- raises a natural resistance from 5 to 10.
Oriental Adventures:
Resist Poison- +4 bonus to saves vs poison
For your feat to be balanced I would drop the poison resistance altogether, as well as the monster summoning. Give player's choice of (1) elemental resistance 2 and make it a big roleplaying thing like demonic blood in the family. I would say throw in a -2 reaction towards celestials and youre good to go. Alternately, go with the poison bonus (+2) but reduce the (1) elemental resistance to 1.
That would be a balanced feat, imo.
Technik
Races of Faerun:
Improved Energy Resistance- raises a natural resistance from 5 to 10.
Oriental Adventures:
Resist Poison- +4 bonus to saves vs poison
For your feat to be balanced I would drop the poison resistance altogether, as well as the monster summoning. Give player's choice of (1) elemental resistance 2 and make it a big roleplaying thing like demonic blood in the family. I would say throw in a -2 reaction towards celestials and youre good to go. Alternately, go with the poison bonus (+2) but reduce the (1) elemental resistance to 1.
That would be a balanced feat, imo.
Technik