Guys I've been trying to get that ring since last year. I tried like 45 times and no ring (i'm not kidding). Until I talked to my friend Angel and he told me he knows a way to get the ICE ring. He told to follow these steps:
1) Go FIRST in the first fire boss.
2) Go last in the last boss.
3) Be the one that kills the last boss.
4) The order doesnt matter in the rest of the mobs just the 2 bosses
Special Thanks to : Angel LotusDust.
Post if it worked cause it did to me here is the prove.