Good Chance
The Black Ice Spear wasn't the true name of the spear, it was just what Leonel had chosen to call it. But, the reality was that this spear had little to nothing to do with ice and frost. In fact, its true name was the Kinetic Blade and its domain was the Kinetic Domain.
Leonel had made Water type and Ice type spears to choose from in the Quasi Silver ranks, but the truth was that this spear wasn't one of them. In fact, this blade worked so well with Leonel because it relied on his Fire and Light Elemental affinity. In this regard, it was even better than the Duality Spear which played on none of Leonel's best affinities.
The reason for the darkness and frost the spear exuded was because it was sapping its Domain of Light and Heat. Leonel hadn't used the darkness ability of the spear at all and simply relied on its ability to absorb Kinetic Energy.