[Shujin]

Verglas is incredibly underused. Spellthieves get the 1M Flying Dagger, too, so I don't see much reason why this shouldn't be a thing!

If anything, you could make it so it can only be used once per round.

Let me toss three of them in Delphias face per round ò.ó. It´s already weaker than splash in almost every way. And dagger has the boon of being unresistable.