I was referring to the scene where you could help an orphan’s monetary troubles with ice
An option that is greyed out if you didn’t summon ice to save your mother earlier, even if you used the tooth to free your father’s corpse in a stunning feat of cryomancy.
Which makes using the tooth to commit a stunning piece of cryomancy a dead-end when it comes to actually using cryomancy. Narratively-How does that make sense? Especially since lore wise the cryomancy all comes from a single source- The Winter Dragon.
I was apparently just mistaken about the sword being the vessel for the dragon’s cryomancy when you defend your mother.