Ifrit.Eikechi said:
yellow is supposed to guaranteed 1 drop actually Shi.. idk what happened...that sucks, but atleast the NM repop item isn't too bad...right?
I always thought Grellow didnt increase drop rate, but only unlocked more slots for the pool to drop:
No Grellow = 1 Stone 100%
Grellow = 1 Stone 100% + X% to get up to 3 stones depending on luck.
We've had Grellow'd NMs that drop 1 or 2 seals, and for most of those kills it was because we had no TH at all in our little groups.
I dont have experience with the T2 NMs like Sobek/CC that havent been Grellowed, but I'm positive 1 is 100%, whereas you are required to proc grellow for even a chance at 2nd and third.
TL;DR: Only 1 stone is always gaurantee'd. Also I've heard of Empousa dropping nothing as well :<.
Edit: Shiomi beat me to it lulz