Mephisto was smiling a bit, more because he didn't have to continually force his voice back into a whisper to speak to Ariel than anything else just at the moment. "Their original name to the mortals was 'עדר', or rougly 'A Herd', or 'The Herd', and the Re'em is a creature of which there are only ever two at a time in the world. They are enormous beasts, larger than you saw me, large as a mountain range. They only come near each other once every sixty years to mate, then the female eats the male, gestates a set of babies, and dies in birth, and the babies do as their father and mother did." He was amused by the tale. "I very much doubt they lived long, they seemed like a silly creature to have."
He picked up his mug and held it up. "Congratulations, Ariel, for achieving where so many other of your kind have failed. You've impressed me."