The Mandalorian Armor 8

There was something nauseating about the humanoid
scent of fear that seeped into the very metal of the cages. Of all the sensory data he had ever experienced, from the acrid steam of the Andoan swamp islands to the blinding creation-swirl of the Vinnax system's countervacuum, those molecules signaling panic and desperation were what Fett found to be the most alien. Whatever minute subcutaneous organ produced fear sweat, it was missing in him. Not because he had been born without it no sentient creature was but because he had forced it into nonexistence, excised it from his mind with the razor-sharp scalpel of his will.-Chpt.6 pg.59-60