Repost because this is important: In wc3 DotA Chain Frost has a VERY threatening sound attached to it. You see that slowly moving frost cloud comming at you with that shrieking sound and you are thinking "oh shit oh shit OH SHIT". Chain Frost in DotA 2 lacks this imo.

The sound when it bounces from target to target should be a bit more intense too, it does not sound frost like enough, using the Frost Nova sound effect for each individual bounce might work.