Right now this Scion feat really feels out of the loop as non viable choice.
Scion of Elysium
(new) +4 to Transmutation and Conjuration spells, +1 to all other spell DCs.
(new) Summoned creatures on hit apply a debuff -1 SR, -1 Saves, -2PRR and MRR (10 stacks), one stack expires in {t} seconds.
(buffs) Summoned creatures gain +30 MP, RP, and USP; +30 PRR and MRR;
Summoned creatures gain +100% Fortification
Summoned creatures gain a 5% chance to ignore incoming damage entirely. Does not affect any incoming Positive, Negative, or Repair effects.
The other feats are extremely loaded for characters, and this is barely adds summons a thing. They are usually dead long before they can benefit from the increased stats.