Quote Originally Posted by Deculture View Post
I hope you realize that Titan Ex is optional and is in no way tied to main storyline. There's also another tier of difficulty for the exact same fight if you want to just "experience" the lore/story behind each primal.
Q: Will the extreme primal battles be part of the main scenario or will there be a quest line similar to the one for obtaining relic weapons?
A: Yes, it’ll be part of the main scenario. By progressing through quests you will unlock the first battle, after which you can move on to the next quest and the battle that follows.

If anything they are "more" main scenario than getting ingredients for the party in Costa del Sol.