Limit breaks.

[Cattastro]

I get the idea of SMN LB. Its 3 bar LB should summon Zodiac primal and do its enkindle skill (AOE). Why Zodiac? because currently he is the most powerful primal in FF universe or dev can implement multiple LB based on egi's that you summon. Its 3 bar LB do ultimate version of your summon enkindle. Its probably be like this:

1) One LB bar - Pet use its ultimate signature attack like Ifrit fire breath or Garuda slipstream or Titan Rock smash
2) Two LB bar - Pet use its second ultimate signature attack like Ifrit dash or Garuda plum or Titan Jump and smash (I forgot the skill name)
3) Three LB bar - Pet use its ultimate enkindle attack like Ifrit Inferno, Garuda Tornado and Titan Fury but in its true primal form

or

1) One LB bar - Summon Zodiac and use its 1st ultimate signature attack (AOE)
2) Two LB bar - Summon Zodiac and use its 2nd ultimate signature attack (AOE)
3) Three LB bar - Summon Zodiac and use its enkindle attack (AOE)

option 2 also can use Bahamut instead of Zordiark