it adds the Coliseum to the Historia Crux where you can battle those two characters and you can try to get them into your team, Lightning is badass so i say its worth it but of course i love Lightning so i would say its worth it no matter what lol.
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4 times fought, yet to obtain either monster crystal (Using monster hunter fragment) Oh well still stuck with my Gold Chocobo Commando (which isn't a bad thing)
I fought them 20 times and yet no crystal
If you have Twilight Odin and Omega, spam their Feral Links. I also had Gahongas spam his SYN Feral Links the first time I fought them and Lightning's Monster Crystal dropped.
The second time I fought them, Amodar's Crystal dropped.
Make sure your monsters have been raised in ways to make them fill the Feral Link quickly. Oh, and my monsters usually got the kill with the Links, it seems that helps, especially Twilight Odin's FL.
Hmm I may have to d/l it, I have the Omega DLC from my Pre-order Bonus, fought that gay thing 40+ no crystal -_- he has 8mil HP takes like 6mins a run