[quote=@Lugubrious]
[list]
[*]For Empress, I don't actually know about there being a connection to ice element myself, since the only Empress character I recall off the top of me head has the Psychokinesis element. I can tell you right now we don't have anyone specializing in ice though, so it's available[/list]
[/quote]

I think this comes from P3, because the Empress party member is Ice-element. 

Most arcana aren't locked to an element, they just tend to have certain elements or physical/magical focus compared to other arcana. (Magician is a great example, as throughout the series the character associated with it has shifted from Fire, to Electricity, to Wind. Expect Ice in P6 or something lmao)