Ice Shard? What the heck is Ice Shard?! I don't know anything about that at all...
In all seriousness though, after reflecting on it, all Nilfheim's kills in Game 1 were all regular attacks. In games 2,3,&4 the opponent's dragons all died (or suffered severe damage) from regular attacks.
On the other hand, Ice Shard was (primarily) used against the squad figures faced.
R˙chean, stop raining man.