I've done over 70 runs of Garuda-EX by now - have 4/5 rings and have never once seen the Nightmare whistle drop here.

I haven't done Titan-Ex as much yet, but have not seen it drop there yet either.

Within my first 15 wins of Ifrit-EX, I've seen the Nightmare whistle drop 3 times already.

Anyone know if there is a higher drop rate on Ifrit-EX for the mount or noticed a similar trend?