Still makes me sad to see people openly writing to be laughing at someone's hopes or tastes, like something like that isn't hurtful at all.

Anyways~

Dragoons, or dragon knights, do kill and hunt dragons. A known part of hunting a certain species, as far as history taughts us, is to subdue the prey to your will. Cavemen would hunt horses for meat before even considering to ride them. If there is a class that has most chances of subdue something as mighty and ancient as a dragon, that is definitely a dragoon.

But enough about your initial example. The quests line to unlock some unique animation is pretty good, and I think I would like something like that. In a way it sounds like the old FF games' summons, like in FFVIII for example, where you had to quest finding and fighting a certain GF before getting their special attack animation (Summon) to aid the group.

I however would rather not have that special attack be a LB specifically, because then everyone would fight to pop their own limit break over someone else's. Maybe give a Special Summon/Special Attack of sort, one-time only, active only during instanced battles (I am suggesting instanced battles because I'd like said attacks to have some brief cutscene of sort, which is something a group content may find hampering).

Still, good idea though!