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See, I just always thought that was because they were the main characters so there was really no need to explore the fact they were using Dragon Force in the main story. Maybe a little...silly on my part, but eh. It's rather disappointing if they can't, though. I always assumed they could. It just wasn't ever really shown because it wasn't really needed.


I would argue that because third gen can do it at will with the help of the Lacrima that they can do it...it might just take a bit more of a shove. What exactly is the difference from being taught by a dragon and the Lacrima, after all? 

Unless those with a Lacrima's magic isn't actually 'Dragon Slayer' magic, but then they can't really be called 'Dragon Slayers' or be users of 'Dragon Slayer' magic in that case, could they?