In Jeuno theres an NPC named Shami that will take stacks of Seals in 20, 30, 40, 50, or 60. If you trade them that you can get an orb, and you can then in turn, trade it to the Burning Circles in Pal Mines, Giddeus, or Ghelsba. Then you fight a boss (BCNM) for randomized loot that can total over 400K. However if you trade 20 seals, its lvl 20 capped for that fight, if its 30 seals, the lvl 30 cap. The more seals the higher the lvl cap is. Recommended to bring only trusted friends in your LS and specific jobs(like BCNM 40 NEEDS a BRD) so you dont fail or/and get ripped off.

And i believe that you trade Conquest Points is what they are talking about.