Dragoon Lore.

[saber_alter]

If Niddy was a Primal, it'd be Tempering.
But as he isn't... it must be their magic (dragon innate or not).

The dragon-kin are smart and can cast magic it seems, according to the story-line quest, and can transform themselves to looking like Elezen.
(Or was it the other way round - wasn't too clear).

its the other way around. the false inquisitor used glamour to temporarily change his form.