[cassius blinks, almost getting fully distracted by the ear. he has never seen eustace's ear wiggle like that.]

Their magic requires the modification of the body in order to take full effect. [and that? that is the most important part to cassius. they might have not undergone surgery, but the crystals in their bodies are enough of a change to him, even if he hasn't experienced the effects for himself.

which... actually, that's a good question too. how would his cybernetics be affected by this crystal.]

The crystal hasn't interfered with my augments yet, perhaps there's some compatibility.