Oooohhh boy, thank you very much. I didn't know that!
Funny how that gives a clear answer, but everyone I saw talked about it as "area".
Mostly asked this, because I'm a BLU, and those Fire Elementals in Adoulin are a pain to spawn.
The best way to get the dual-elemental spells is by doing alluvion skirmish in yorcia. Grab a few other blus and try a 131. Level 1 head, level 3 body and level 1 feet. This gives you more time to learn the spells. Take the enemy encampment down with the book pets but don't finish it off. Elementals will keep spawning after you kill them.
I can't remember what eudamon segment we used but I don't think it really matters. Should only take a few runs for everyone to get all the spells.
Cheers.