Ok, so metal can shatter the frozen status effect, which deals 80% extra damage, more than any other synergy in-game. Now, imagine what happens when you have metal that’s infused with ice?
(And yes, I know Vetex hasn’t added lost magic yet and this is mostly speculation, but still)
I think having a magic that freezes the enemy and then deals an extra 80% damage would be too op but there will be awakenings so you could have water (to make the enemy soaked so they can freeze), ice (to freeze the enemy), and then metal.