Quote Originally Posted by Protey View Post
Ardor is not a party only spell, rdm will not have to be in the main party.
Actually that may not be the case, according to S-E's post regarding Ardor:

Quote Originally Posted by Gildrein
• Ardor (RDM Lv.64, affects a single ally)
The wording of "ally" indicates it can't be cast on just anyone, such as any player outside of your party, just like Erase. And with that being the case, it also can't be cast across alliances, just like Erase. That said, it's pretty much guaranteed it will be within your own party only.

(Unless it has some weird job-specific mechanics like SCH and Regen spells, then it could be cast across alliances. But it's just speculation at this point - until the spell is released, there's no way to state for fact it is or is not party-exclusive.)