Apparently dragons can corrupt people just by looking them into the eyes, touching or even hearing them. The eye of Nidhogg (who I think is or was the baddest dragon around) is locked away in Ishgard (after the first dragoon poked it out of his head) because of that reason. The other two, touching and hearing, could perhaps be just Ishgardian exageration about the matter.
Here is an older thread about the matter. Scroll down to Sounsyy's answer.
We can assume that dragons are intelligent, at least their elders, who in some FATE's are blamed for sending the dragonkin to attack Ishgardian locations.
Here is an older thread about the matter. Scroll down to Sounsyy's answer.
We can assume that dragons are intelligent, at least their elders, who in some FATE's are blamed for sending the dragonkin to attack Ishgardian locations.