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Ill be fair, this puzzle is pretty clever. Entering the area always tells you about the ice beind cracked but it doesnt do anything standing on it. Narcissa's quest had a similar part and the answer there was to change the field in a wild battle, so I checked the field manual for icy surface and it specifies if there's a field below it, a move like Bulldoze will crack and reveal it. Lo and behold, it actually worked.
Now we wait for this puzzle type to get abused to hell and back, making my compliments entirely meaningless as it becomes a "oh god dammit need to get the manual and pc out again" deal whenever I get text when entering a room